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Fiat 411R Tractor Service Manual

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1. Sect A A Cross section on fork lever Sect B B Cross section on commutator Fig 165 Sectional views on starting motor type E 115 3 24 Var 2 1 Starting drive pinion 2 Fork lever 3 Solenoid core 4 Solenoid coil for motor field coi end 8 Commutator 3 Armature 10 Field coil 41 Sieeve 12 Overrunning clutch hub 13 Ov clutch A Solenoid core travel 8 8 10 1 mm 0 334 0 397 B Solenoid mobile contact travel 6 4 8 45 mm 0 25 C Armature shaft end play 0 35 0 75 mm 0 0138 0 0295 D Solenoid terminals 5 Solenoid terminal 6 Fixed contacts 7 Clamp errunning 2 0 333 Motor disassembly The starting motor can be dismantled into the following su bassemblies solenoid unit commutator and bracket assembly armature assembly clutch assembly pinion end bracket assembly motor frame assembly Parts to be removed Operations and cautions The solenoid Remove the screws fastening it io the Support also the field coil end from terminal 2 Fig 163 Lift the solenoid assembly and take it away To dismantle it remove the upper cover in order to disengage the coil end and make free the central part of the solenoid body 3 from the screws fasten ing it to the support and from the terminal ends To remove the solenoid coil core remove the split pin and the mobile contact nui 118 Commutator end head Remove ihe nuts and the tie rods fast
2. fi Fig 174 Arm control Shaft section 4 Cylinder discharge valve 8 Lift arms contro shaft 9 Shaft bushings f Through Port in the control Spool P Control spool s Torsion spring S Lift arms t Contro spool adjusting plug L Linkage control lever B I Fig 175 Sectional view of the hydraulic liit unit 3 Cylinder pressure safety valve 4 Discharge valve 8 Piston 7 Ram seat on piston 10 Arms max lift adjust ing screw H Spring adjusting shims M Spring D E P F g c See Fig 178 The arrow indicates the lather gasket Placed between ihe piston and the rubber seal on fiit units up to No 68992 a Sectional view of the cylinder intake valve 2 Lift control valve 5 Cylinder intake valve h Groove machined along he control Spool axis to discharge the oil the pressure of which keeps valve 2 closed by acting on the top of it P Control spool b Detail of section through the control spool r Control spool C Sectional view of the piston of the hydraulic liit No c6993 and up d Starting from tiftn 27108 up April 1982 the number cf top link mounting holes has been increassd from 3 to 4 d i 121 i H j SEM VONNNNSSNSNNNNSNNYS posce SE I EU yl Bazzaz d
3. Fig 160 Electrical diagram of the arrangement for setting the cut out relay B 2 V battery B 40V battery A Ammeter 20 A top reading 196 accuracy V Volimeter S0 V top reading 0 5 accuracy class connected across terminals 51 and 31 P Potentiometer voltage adjusting capacity must be such that the cut out relay shunt winding coil consumption does not create notable variations of the no load voltage measured by the voltmeter S Warning light indicating opening and closing of contacts 2 V 3 W bulb R Rheostat 4 ohm 20 A R Drop resistance sufficient to allow lighting up of the warning lights S by switch T with the cut out reiay contacts ocen Voltage regulator setting s i d D 1 H I 4 4 T T Fig 161 Electrical diagram for setting the voltage and current regulators G Generator DC 115 24 7 8 and its versions V Voltmeter 30 V top reading 0 595 accuracy class A Ammeter 10 A top reading R Rheostat 3 ohm 20 A B 12 V 100 Ah batteries connected in series fully charged Switch Current regulator setting 106 once thermally stabilized bring the vollage to 25 1 to 25 9 V through potentiometer P adjust the load on the calibration spring 3 Fig 158 by bending its metal tongue 5 until the light S goes oul bring potetiometer P setting back to the minimum Increase the voltage again acting once more on the potentiometer and check that t
4. Checking ohmic resistance Field winding resistance af 20 C 689 F should be 14 5 to 15 5 ohms and may be measured between terminal 67 and ground when generator is assembled Armature resistance at 20 C 85 F is 0 520 io 0 545 ohm it should be measured only exceptionally to avoid damaging the commutator bars owing to ihe soldering of two pieces of wires Spaced of 180 Fig 133 Field winding test Connect the measuring instrument ends to terminal 62 and to ground Disassembly Proceed as follows remove the commutator head disconnect terminal 67 unscrew and remove the through bolts femove commutator end bracket and slide out the armature with the other bracket clamp armature in a lead jew vise and remove the drive pulley and the remaining bracket Troubles Repairs Battery charging faults may be due to faulty generator other trouble in the system Make sure to locate trouble first The tell tale lamp may furnish an indication with engine stopped or running at different speed rates If the generator is faulty the cause may be sometimes found elsewhere and particularly in the regulator group or in the circuits therefore the operator should take care of generator efficiency and also check the regulator group and the whole system in order to prevent repetition of the generator trouble after its reconditioning The battery charge spy lamp may be helpful to detect trouble 1f
5. check ihe voltmeter value when cut out relay closes it must be read at the moment the lamp of 24 V 8 W lights insert lamp between terminal 30 and ground Closing value must be 25 1 to 25 9 V for both pre modification and post modification groups Checks should be made when cold before coif temperature increases 2 Back current at 25 109 C 77 50 F Wiring should be made according io Fig 144 and generator run to 2000 R P M during about 8 minutes making sure thai volimeter reads at feast 29 V then decrease the generator speed The ammeter pointer which was indicating a certain charging current will decrease and approach io zero and begin to show the inverted current value As the generator progressively slows down the ammeter dial will show increased values up to a cer tain limit after that a sudden fall to zero will be observed due io the opening of the cut out relay points Such a current value will be not larger than 3 A for groups having production number up to 088917 and within 5 to 10 A for groups from number 068918 up Note Such a tesi should be carried out quickly to avoid battery discharge When repeated start from a stopped generator Regulation voltage at half foad on batteries at 50 3 C 122 37 4 E Close the cover and connect it according to the dia gram of Fig 145 and operate the group until the coil temperature reaches 47 to 53 C 117 to 127 F Start the generat
6. Remove the gear casing supports and remove the bevel gear complete if the differential casing inner bearing races have to be removed use puller A 531105 Fig 108 Bevel ring gear assembly with differential 1 Differential lock 65 Fig 109 Rear transmission components 1 Differential lock 2 Power take off driving gear Ra Bevel pinion roller bearing adjustment shims Rb Ring for centering bevel pinion on ring gear Rc Ring gear adjustment shims The bevel pinion Unscrew the bevel pinion shaft fastening nut using wrenches A 711109 and A 611108 and stopping the rotation with the brass hammer A 061322 Remove the shaft by applying a bronze punch upon its front end and hammer it out The power take off driven gear and the spacer are removed from the casing upper opening after setting ihe power take off engagement lever in the position marked CAMBIO gearbox Inspection of the stripped components of the differential casing and differential lock Accurately clean all stripped out components and check if the gear meshing surfaces are in good con ditions check the differential gear thrust rings and the pinion bushes and thrust bearings vs the wear limits oi page 69 hen replacing bushes after assembly ream with expanding blade reamer U 611914 to achieve the prescribed clearance check the copper lining on crown wheel hubs and replace such parts if the coating is not sufficient ch
7. SS rst X Fig 100 Gearbox section ir 2r 81 1 2 3 are indicating respectively 1st 2nd 3rd 4th Sth and 6th speed obtained by the displacement of the epicyclic reduction gear sleeve according to the arrow direction indicated by r or opposite to it Ra Taper roller bearing adjustment shims Rb Ring for centering the pinion on bevel ring gear Section C C ihrough casing forward wall and corresponding to the control rods As Red Sf Balls Mo Ball springs b Reverse gear section 61 Fig i01 Epicyclic reduction components Note Starting from chassis No 427935 up helical teeth have been superseded by straight teeth Epicyclical reduction gear Fig 101 Primary shaft Rods and forks for the gear control Fig 98 Fig 103 Orientation of the various spring pin cuts with reference to direction of force F or of rotation Gearbox cover with control lever Fig 98 62 Assemble the epicyclic reduction gear components according to Fig 101 Mount on the gearbox the primary shaft rear bearing 6 and fasten by its pin V the inner thrust disc 14 having its lubrication passages loc led as in Fig 98 Mount on shaft front end the bearing the oil baffle and the elastic rings slide in ihe shaft from the case front side and fit on it the first second and third speed gears mount the primary and secondary shafts front cover
8. the cut out relay contact closing temperature This lest sould be performed immediately after the M Test bench elecitic motor G Generator DC 115 24 7 3 contact closing voltage test in order io keep the and its modified versions V Voltmeter 30 V top reading thermal stability reached in ihe preceding lest 100 i i i H P LENE E Fig 195 Electrical diagram of the arrangement for testing the cut out relay return current M Test bench electric motor G Generator DC 115 24 7 3 and its modified versions A Ammeter V Voltmeter 30 V top reading Voltage regulator check Current regulator check Fig 156 Electrical diagram of the arrangement for testing the voltage and current regulators M Test bench electric motor G Generator DC 115 24 7 and its modified versions V Voltmeter 30 V top reading A Ammeter 10 A top reading Hook up according to the wiring diagram of Fig 157 and run the generator up fo 3500 RP M holding it at this speed for 5 mingites See that the voltmeter reads af least 29 V then gradually decrease the generator speed Tha ampero meter indicator which had shown at first a certain amount of charging current will gradually go to zero then will show ihe reverse current on the opposite scale As the generator speed gradually decreases the reverse current will inc
9. 0 0078 3 6692 The ring Rb should be 0 2 mm thicker than the one installed calculated by subtracting 93 4 93 2 0 2 mm in order to set the pinion at a distance of 93 2 mm according to the indication marked on it Example No 2 Reading on the tool quadrant 92 6 mm Measure read on the pinion 0 mm Distance between pinion and bevel gear 93 0 8 92 7 mm The ring Rb should be 0 1 mm thinner than the one installed calculated by subtracting 92 7 92 6 0 7 mm d Check with a dial gauge the tooth backlash which should be 0 20 mm 0 008 the correct backlash can be obtained by shifting adjusting shims Rc from one support to the other in order to set the bevel gear farther or nearer the Pinion as required The overhaul thickness determined according to paragraph b should not be altered SPECIFICATIONS ASSEMBLY CLEARANCES AND PERMISSIBLE WEAR OF THE DIFFERENTIAL COMPONENTS Assembly clearances mm in Weser limits i S ee B i Between pinion and crown wheel tooth backlash 0 20 0 008 i Between splines of differential axles and their gears 0 010 te 0 106 0 0004 to 0 0042 0 4 0 0157 Differential pinion and gear tooth backlash 1 0 15 0 0059 0 5 0 0197 Between bushes and differential pinion axle 0 020 to 0 093 0 0008 to 0 0037 0 25 0 0098 Between casing and differential gears j 0 080 to 0 158 0 0031 to 0 0062 0 35
10. 0 0138 Between differential lock collar and casing 0 120 to 0 246 0 0047 to 0 0097 0 5 0 0197 MM M Specifications mm n Crown wheel adjustment ring shim thickness Rc Pig 130 Pi i Ae eek e dee eua Rim ke 0 3 0 5 0 7 toler 0 02 0 0118 0 0197 0 0278 4 0 0008 Bevel pinion shait adjustment shim tickness between 9 8 3 9 4 4 1 4 2 4 3 4 4 4 5 4 6 0 1486 0 1535 0 1575 0 1614 0 1654 pinion and rear taper bearing 2 0 04 4 7 4 8 toler 0 02 0 1693 0 1739 0 1772 0 1811 0 1859 0 1890 0 0008 Bevel pinion shaft bearing adjustment shim pack thick 1 7 1 75 1 8 1 9 2 2 1 2 2 2 25 2 3 0 0569 0 0689 0 0709 0 0748 0 0787 nes ahaa d ee s AT Sta Lu toler 0 01 0 0827 0 0866 0 0886 0 0908 i 2 0 0004 Differential gear thrust ring thickness 2 1 475 to 1 525 i 0 0581 io 0 0600 Differential pinion reund thrust washer thickness 14 to 1 6 0 0551 to 0 0630 Tightening torque of bolts assembling planetary gear casing to crown wheels aaan 45 to 5 kgm 32 to 36 filb i re ne Differential lock control fork spring Spring free ienth 2 ee 188 7 4018 Spring length under check load 1 0 04 4 126 8 4 9803 Check load W Ae e dira ES 28 5 to 31 5 kg 62 8 to 69 4 Ib i i i C Rings of oversized thickness of 01 mm 0 0039 in are available Wear limit of a shim 1 mm 0 0394 in FINAL DRIVES Each consists of a pair of g
11. 18 55 100 mm 3 8 214 7 4 354 399 444 mm 14 159 a 1711 229 160 100 40 mm 855 81 4 4 538 mm 2749 28 mm P 138 TABLE OF CONTENTS Page Foreword and Service Notes na 3 Engine jou tous d De s 4 conu ICM 4 Operation l s s 4 Removal 5g oka we aranan 5 Disassembly 8 Overhauls and Cheks 0 11 Cylinder block and barrels D Cylinder head lul 12 Timing gear owe 2l LL 13 Valves guides and springs a 13 Valve tappets and rocker arms 14 Camshaft msu ma ee Ls 15 Specifications oaa 16 Power chain wo ee 17 Pistons xli diu Ro 17 Connecting rods uL 19 Crankshaft 2 sn 20 Main and connecting rod bearings 21 Specifications a 22 Lubrication 0 2 22 LL 25 Ollpump a e e E aa 2 Qil forbes see te L vue 26 Specifications aa 27 Eobling iag a er ru LU 28 Water PUMP 0 28 Thermostat a pee SE oo eS 28 Radiator l gaa a a 29 Fan ss rente sud ei E 30 Air feeding ee 30 Alr cleaner so 2 1 30 Fuel feeding 7 Lu 30 BUS talk Somme sten mere ir beta 31 Feed pump oll 31 Injection pump and governor 32 Calibration data 0000 41 Injectors llli 43 Specifications 0 5505 44 Reassembly of SAGING v vov o s uu 45 CUMING pel uo o n see E vll uid ha 48 Brake fest a To 2 50 Performance data 0 51 Transmission 0 53 C
12. 190 must be considered as a pratical working dimension for new fitt units A Lift control fever B Selector lever r Reaction roller the clearance is 148 to 15 1 mm 0 583 to 0 594 in and 29 9 S Lift arms P Load to apply to the support bracket to take to 22 5 mm 0 874 to 0 888 in Tespectively up the play existing between the parts indicated by the arrow 127 Important To be sure to make the best use of the power lift in every circumstance read the following instructions Position control operation Move lever B Fig 190 b downwards and insert the strut support wedge as shown in Fig 182 In these conditions the holes of the support shown in Fig 176 can be used to mount the top fink Draft control operation Move lever B upwards Fig 180 b and take the wedge away from the strut support Fig 192 For a more sensitive operation use the intermediate holes but not for implements which determine heavy loads on the strut rippers disc plows etc which require the use of the lower holes Exceptionally and only for very light work requiring high sensitivity use the top holes Never mount the top link in the top hole for all other cases in order to avoid excessive stresses on the spring A shims for end play of 0 1 to 0 3 mm 0 004 ta 0 012 In GERE ENERO I ES Fig 191 Sectional view of the hydraulic lift linkage rods D Right liting rod S Let lifting rod AUXILIARY COCK Th
13. 2 Terminal 51 3 Terminal 30 4 Voltage regulator to current regulator connection 5 Current regulator series winding terminal soldered to circuit breaker amp Cur rent regulator fixed contact connection with the regulating resistance 90 Fig 138 Cross section of regulator unit section shows voltage regulator 1 Armature adjustment spring 2 Calibration screw 3 Vol tage regulator body 4 Armature 5 Fixed contact holder Screw 6 Fixed contact bridge 7 Hinge steel Spting the bimetallic blade is located on top 1 Fixed contact bracket 2 Pre load shim 3 Hinge spring steel bearing mobile contact 4 Body 5 Armature stop 15180 mn 8 Calibration screw 7 Adjustment spring L Thermal compensation by metallic blade a Up to No 088917 b From No 088918 up R Armature rivet C Contact gap 0 7 0 85 mm 00275 0 0334 for armature fitted with rivet R for rivetiess armature the distance between contacts Voltage regulator Current regulator Cut cut reiey N C Fig 148 Cross section of regulator group Across circuit breaker is 4 15 4 30 mm 0 0452 0 0812 The wiring diagram of Fig 127 shows the regulator group fuse The diagram of Fig 142 represent the characteristics of the post modification and the pre modification groups The junction zones between the two hatched strips represents the fun
14. 45 65 A Running generator before plotting of Ajr p m curve hot Voie a MORE ODE EU MMC es 2900 caus condition run duration 30 Minutes n 5 Currents ssc eae s lau oA 875 798 A i of 45 min at 2900 np m Ruming 2 uu of 15 min at 5800 rpm Heating t 2 uu Von al pret DRE tt DS S Commutator temperature not more than 90 C 1940 F Casing temperature not more than 09 C 140 F Resistance at 20 C 689 F ohm i Field coils between terminal 67 and ground j 15 5 15 9 Ohm FIENNES eroe a E shalt Bg chee oe 0 30 0 32 Ohm Commutator bar maximum allowed outof round 9 01 mm 0 00039 Brush end play with respect to holders 1 0 1 0 4 mm 0039 0 01577 Pressure by springs on brushes Mew gin e a i 0 69 0 76 kg 1 52 1 67 lb Diameter between pole shoes middle MAS aches uai z i 70 6 70 75 mm 2 779 2 785 AIP M DM 0 3 0 45 mm 0 0118 0 01777 Tightening torque of drive pulley net Le 7 kom 50 6 f 1b i H 89 d CONTROL BOX MOD A 3 140 24 Description The Fiat A 3 140 24 regulator unit contains three elements voltage regulator current limiting regulator and circuit breaker These three elements Fig 138 fastened to the block are enclosed in a sealing cover equipped with gasket which prevents shocks dust and dampness Note A distinction will be made in the test between modifications made on regulator units with numbers
15. H i i i 12 000 to 12 043 0 4724 to 0 4741 i Between drag link end bush 0 000 to 0 070 0 3 and its pivot 0 0000 to 0 0028 0 0118 41978 to 12 000 i Q4714 to 0 4724 L Note The steering arm upper and lower bushes shall be mounted into their of 0 05 to 0 23 mm 0 0020 to 0 0081 in bushes for steering box side cover shall be mount of 0 013 to 0 063 mm 0 0005 to 0 0025 in Assembling torgue of steering transverse f ie rod clamp screws is of 25 kgm 18 1 11 15 seats on the support with an interference ed with an interference 8 The data are the pre modification ones the post modification ones from Tractor with frame No 402251 have been increased of t mm 0 0894 in 76 FRONT AXLE Checking the front axle Removal Fig 124 Dismantling Checking components Place the engine sump on a stand or hydraulic jack drain radiator water and slacken the rubber sleeves band elamps disconnect the drag link from the steering arm and the radiator shutter conirol from its front end disconnect the head lamp cable connection fasten ihe two ends of a rope in the radiator upper section and insert wooden two wedges to stop front axle oscillation remove the sump screws fastening its forward end to the radiator Support and move ihe front axle assembly forward remove the radiator cowling and the radiator Apply front axle to rotary stand see Fig 125 To str
16. No No 1 fuse 18 A for the control box protection 2 batteries 12 V of 54 Ah capacity at 20 hrs discharge connected in series 1 1 electric starter 3 Kw equipped with a solenoid Mod E 115 3 24 five position starting and lighting switch No 1 three position lever type switch for starting and glow plugs No No 2 three light headlamps each with a 50 45 W bulb for driving and passing lights and a 10 W bulb for No No No No No No No No 4 giow plugs 140 W parking light 1 dashboard lamp with 10 W bulb 1 battery charge warning light 10 W bulb 1 fuse box with four 8 A fuses for equipment protection 1 tailight with 10 W bulb 1 combination number plate and tailight with 19 W bulb 1 two pofe rear socket l 1 rear floodlight optional 1 electric horn with push button control and 8 A fuse optional Lighting and starting switch Each position of the key on the switch corresponds to a circuit and precisely position 0 30 304 All circuits off position 1 30 51 304 Starting switch battery charge warning light position 2 30 51 30 1 58 Starting switch battery charge warning light front parking light dashboard fight number plate and tallights two pole socket 100 mm dia floodlight with built in switch 81 position 3 30 51 30 1 58 56b Starting switch battery charge warning light front parking lights dashboard
17. is stopped the load drops Not so ffrerent prouve so ise litt running theload keeps j 1 No oil 2 Control valve Sticking 3 Hydraulic pump does not work i 1 Oil level very low j 2 Oil filter clogged up 3 Air bubbles in suction ducts 1 Faulty adjustment of valve spool 2 Faulty sealing or sticking of discharge valve 3 Oil inlet valve of hydraulic cylin der leaks 4 Oil leaks past lift piston seal or cylinder seal 5 Cylinder pressure relief valve leaks 8 Discharge valve seals damaged 1 Pressure relief valve out of ad justment 2 Cylinder pressure relief valve out of adjustment 8 Low pump efficiency Pressure relief valve cuts in when lift arms are gf raised Ape faily d Traces of engine oil in the hydraulic fluid 1 Lift arm stroke adjustment screw out of adjustment 1 Oil leaking through between hydraulic pump and seal Top up Dismantle and clean it Overhaul the pump Top up Clean it Check fittings and Seals Readjust the valve spool as specified on page 125 Dismantle and check the parts in volved assemble the valve tighten j ing the plug with a torque wrench set at 9 to 10 kgm 65 to 72 Ib in order to avoid possible distor tions Dismantle and check the parts in volved Replace them Replace it Replace them Check setting Test pump performance and over haul it if necessary Take a few shi
18. self welding of the voltage and current regulator contacts tn all the above cases excluding case e one of the two following conditions will occur on disconnecting the cable 67 from generator to control box 1 Output remains high trouble covered by point c 2 The output stops completely the trouble lies in the contro box which should be checked as to points a b d and f Se M v i Note If the generator output remains high even after a long period of charging but neither trouble nor high temperature show up in the contro box the battery is old or maintenance wrong lt does not absorb any more current the voltage does not rise above a certain value and the generator current does not decrease C Discharged battery and high charge Condition of correct operation of the generator and control box unit D Discharged battery and low or no charging rate This condition is due to the following 8 burnt control box fuse b interruption of the additional resistance of the cut out relay shunt winding 11 Fig 159 c loose connections defective cables d defective battery e charging system high resistance f voltage or current regulator low voltage setting g voltage or current regulator oxidized contacts h generator trouble Should the above condition be caused by the failure of the additional resistance 11 Fig 159 replace it lf on the other hand it is caused by
19. up to 088917 and on those with numbers starting 088918 up the numbers are marked on the cover Figs 139 and 140 represent voltage regulator and circuit breaker the curent limiting regulator looks quite similar to the voltage regulator Fig 141 represents the wiring diagrams of the regulator units mounted on tractors series 400 and bearing the production number up to 088917 and from number 088918 up The diagrams have thick lines to represent the coils in series on the generator recharge circuit to differentiate them from the shunted ones on the same circuit All armature stops are of the spring blade type and adjust their load according to the calibration value through the screw located at each regulator unit element side The temperature increment due to the shunted circuit currents and deriving thermal expansion might influence the calibration values of the voltage regulator and of the circult breaker This is prevented by the contact hinges which being bimetallic are thermally compensated The group bears the following terminal numbers 51 connected to positive gensrator terminal 67 connected to generator field coils 81 grounded 30 connected to the battery positive terminal and to electric system The wiring diagram of Fig 127 points out the valve FPG protecting the regulator group Fig 136 Regulator unit from no 088918 up as seen from the circuit breaker side 1 Terminal 31
20. 026 to 0 030 and the air gap measured on the expansion edge of the core facing the contacts Axis A A Fig 150 and with contacts closed should be 0 25 mm 0 010 Then follow test bench checks reported on page 100 to ensure that the trouble has been completely eliminated and reassembly has not altered in any way the operation of the various parts CUT OUT BELAY eX CUT OUT RELAY Fig 157 Control box GP 1 24 7 with toot A 127050 installed Fig 158 Rear view of the control box to replace resistances 6 and 10 Fig 159 1 Cut out relay armature hinge 3 Setting spring 4 Fixed 5 Setting spring support tang contact support tang 5 Setting spring support tang d 31 Ground Replacing the resistance on the voltage regulator shunt winding and the resistance of the current regulator and cut out relay shunt windings 7 11 Fig 159 If the voltage setting of the regulator has changed that is regulating voltage is low reguiating voltage rises to high values because out of control the cause can be attributed to the resistance of the voltage regulator shunt winding 7 Fig 159 which can be altered short or interrupted A coil short increases the absorption on the part of the voltage regulator shunt winding because the resistance is connected in series to said winding and increases the pull on the armature resulting in a lower regulating voltage Should the resistance be interrupted the voltage regul
21. 187032 A g 123 Remove the fifi outer arms the screws which fasien the levers to the inner arm 21 Fig 477 and Slide the shajt in the direction shown by the arrow Note To prevent damaging the seal ring located on the left end of the arms control Shaft move the shaft about 2 cm 25132 in the sense opposite to the arrow and remove the ting Fig 177 e a ay gs The inner arm with its piston driving strut remains inside the power lift Arms control shaft Remove pin 0 which fixes the valve Spool control lever to its link prior to sliding the whole unit off the studs Control valve Fig 178 Note The following components remain free inside the power lift the lever mechanism which is removed by un screwing the screw R first and sliding off the outer fever L in a second time the piston and barrel The fatter can be slid out the front by applying a slight force The valves can all be disassembled easily enough as they ail are accessible from the outside with the exception of the oil inlet into the power cylinder valve 8 which requires removing the control vaive group To disassemble the controf valve slacken the screw which fixes the control lever Q remove the adjusting plug t and the side cover of the control Fig 162 Lift outside and inside control finkage The illustration shows on top the outer leverage removed from the lift below the insi
22. 3090 1b Weight of the two front wheel weights approx l l 70 kg 150 Ib 10 kg 150 Ib i Weight of the jour rear wheel weights approx 2 aaa 220 ka 480 1b 220 kg 480 1b PERFORMANCE AND FUEL CONSUMPTION i j Speeds with engine at rated speed on concrete I course i k p h o mph kph mph Mk gea i edd nakaa ER C PT Ae e DA edet A ph hy H 2 2 1 4 21 i 483 BAG Qe ati sr Ws LAS ToS S vedere iuo in pir wu TUA domm nes a nos 40 25 38 2 4 did gea sos aimer das REOR QURE ACER AR NOS RU qe Eae us 6 3 39 64 38 4th Cease oi ik Gls Rob ek CX OE rv Aa eer S 8 0 5 0 7 7 4 8 Dif aed how VEU Quo V now pies e ITE e NL FAR Vo DS i 14 5 8 0 14 0 8 7 Bt Re ERE o doe v Neutra NEU erue ROC RE Bos teh Gee E e dk 22 9 142 221 13 7 ist TeVelSe cu Pon tnt vue ce ats LU ED RT WEAR 833 20 32 an rd reverse sus eat testo ee ede Iso ar YAN DA NY te 1 8 73 Hh 74 Diesel fuel consumption ee ee 3 5 4 kg 7 7 8 8 Ib 3 5 4 kg 7 7 8 8 b Maximum drawbar pulls on concrete course with trac i tor fully ballasted iron discs and 75 water ballast H ed tires i 1sP gear suo She Bae eee sos SEA ee Ge A hte ER dea ee te 1500 kg 3 300 tb i 2nd dear sateen hue ae GA P Li s eco Aik Std nae WE Bes ces 41500 kg 3 300 Ib 9 EM UAE cca 1500 kg 2 300 1b the same as for AE SNP C IO LOU RR Ay EARS ES aseo XD ot CE Eu 1350 kg 3 000 ib type 615 100 BUN caeli eui rbd ese Er Dn VERE Urd
23. 45620 F through the insulator when energized by a 26 V current The glow plugs are shunt branched nominal voltage 24 V 140 W each Removai and cleaning Before unscrewing the plugs free their terminals Clean them with a metallic brush wash in gasoline and blow them dry Checks on the test bench a Check the plug current absorption at 24 V 5 82 0 2 A b Sealing The plug is screwed in a seat similar to the one existing on the engine in a vessel the pressure of which can be raised to 30 kg cm 426 70 p s i Air leaks agalnst the atmospheric pressure of 760 mm s 9213 of mercury shall not exceed 2 cm 0 1290 cu in of air ATTACHMENTS POWER TAKE OFF The power take off assembly is located inside the transmission casing rear cover and may be actuated by a lever directly from the crankshaft or from the gearbox through a gear installed on the bevel pinion shaft Fig 81 In the first case the power take off shaft runs at a speed proportional to the engine 575 p m engine running at 2300 r p m and in the other case the speed is Proportional to the tractor forward travel 3 75 revolutions per meter of forward travel Major overhaul Removal Drain differential and gearbox oil set the control lever for engine drive and remove the screws fastening the rear cover io the trans mission casing Fig 105 Note f tractor is fitted with hydraulic lift there is no need to remove it we Suggest inste
24. B Driver cylinder liner removal and installing 2 fi 17 A 227008 Puller iniection pump drive a Pra vire qr fe 36 A 287033 Adaptor set differential lock installing a n 87 107 A 313009 Driver valve guide removal and installing 1 18 A 323007 Puller injection pump plungers 5 1151717 36 38 54 A 323010 Wrench set injection pump adjustment 0 40 A 323023 Support injectors iru he a re Uns 2 44 87 A 323025 Puller injection pump shaft bearing 36 53 A 323026 Puller pump bearing outer race 37 i A 323033 Retainer forks injection pump followers x 35 86 38 A 323035 Tool injection 36 38 A 323044 Screw driver aa Wade Ay E inip Wet ed a 36 A 423112 Measuring set for control rack travel iP is Aris 41 A 517007 Riveting set 11117 je ace 72 A 517031 Wire brush vi ias eid re qi ee aa idus 12 A 527002 Connection injection pump plunger stroke check 40 i 60 A 527005 Pullet injection pump delivery valves dep sepes 36 A 527015 Connection set with pressure gauge injectors and pump elements check ad er mr ee 39 A 537105 PUR oo ere a ce cea aioe bore S ak A see S i 65 A 611108 PUDONG os son wies DAS A p RD RE UN 56 A 619018 Clamp piston tingBs TAN ae Boley 18 20 46 2T A 619022 Pliers piston HAS 2 LLLI LLLI a 18 20 A 619027 Paller pilot bearing in flywheel use NN 53 A TAT0S3 A Fixtures main clutch dismantling and reassembling 54 55 5
25. C 140 F Steering system f lt i SAE 0 oil Front wheels 2 0 i Chassis grease Grease nipples 0 i a d Chassis grease i i 4 1 SAE 140 oil for temperature above 10 C 14 F MULIER E E 94 2 3 P SAE 80 oil for temperature below 10 C 149 Hydraulic lft 2L 2 31 SAE 20 hydraulic oil supports i re High melting point grease Generator wicks po SAE 80 HD oil Starting motor bverrunning clutch LI High melting point grease i 186 i l f I F i i i MODIFICATIONS Starting from the tractor with engine No 020425 and chassis No 411789 up the fuel filter and feed pump have been modified as follows DOUBLE FUEL FILTER In addition to the single paper element a cloth element has been added inspect each 300 hours the filtering elements to check their efficiency and to wash with kerosene the cloth one and replace if necessary the paper element which must not be washed Fig 197 Two element fuel filter Fig 198 Injection pump type PES 4 A 60 B 410 L4 16 1 Filter air bleed screws a Filtering cloth element b Paper 1 Cover protecting the pump contro sleeve 2 Reference filtering element marks 3 Pump fastening nuts c Feed pump fuel filter After the filter elements assembly bleed air as follows screw back of two turns the screws 1 fig 196 unscrew the knob of the priming pump of fhe
26. L Linkage control lever U V z Top link mounting holes Starting from lift No 97108 up the number of holes has been increased from 3 io 4 see Fig 175 122 Fig 177 Removing the arms lifting shaft the arrow shows the direction of extraction 21 Screws which fasten the levers to the inside arm L Link age control lever Dismantling the power lift Fig 178 Removing the valve block 17 Valve block L Linkage control lever Cotter pin connecting the link to the control spool lever Q Set screw connecting the contro lever to the control spool R Access port for removing screw R see Fig 182 t Cantrol spool adjusting plug To remove the unit from the tractor Separate the arms from the implement hitch first then disconnect the two oil lines and remove the screws which fasten the unit to the transmission housing To dismantle the power litt proceed according to the following sequence Components to be removed Filter 11 Fig 183 Outside linkage 12 Cover 13 Fig 180 Undoing the auxiliary equipment control cock Screws Operations and cautions Pull the parts out the lift box Remove the complete assembly freeing it from the lift box and spring support Can be removed together with the Spring support Fig 178 Cylinder discharge valve parts 4 Plunger ANO Fig 181 Testing apparatus for safety and pressure relief valves using valve holder A
27. PERMISSIBLE WEAR amane eea x Wear limits i Assembly clearances mm in Ere in Betwaen wheel drive splined shaft and its disc 0 010 to 0 106 0 0004 to 0 0042 0 35 0 0138 Between power take off clutch splined shaft and its dise err et 0 013 to 0 115 0 0005 to 0 0045 0 35 0 0138 Between wheel drive shaft spline flanks and flexible joint collar s s er or nr 0 024 to 0 072 0 0009 to 0 0028 0 20 0 0078 Between disengagement lever bushes and their pins 2 se pe o os o o n n ao 0013 to 0 064 0 0005 to 0 0025 0 30 0 0118 Between shaft and clutch throw out collar 0 030 to 0 145 0 0012 to 0 0057 0 30 0 0118 Clutch driven disc thickness wheel drive and power take off complete with friction lining 8 6 0 3386 YE 0 2758 Tightening torque for flexible coupling flange nuts Fig 99 2 5 kgm 18 ftib Spring free length 6 s ehh tenn Spring length under check load 2 n t ttn Chick load 25 Soar i Vor R URGE dom Aca a y oe Ea lt elk yea 64 65 5 ihs CMe S z 57 GEARBOX AND EPICYCLIC REDUCTION GEAR Dismantling Stripping of components Remove the gearbox from tractor as follows Paris to be disassembled The engine with its front axle The steering box The two foot boards the rear lamps cable and the clutch disengagement tie rods Operations and cautions Follow the sequence described on page 53 for the main clutch removal If the tractor is provided with oil
28. V Check that absorbed current under such a voltage is 3 5 5 A at 950 1150 R P M As test is finished immediately disconnect terminals 51 and 67 short circuited to avoid damaging ihe field coils as generator speeds up amp ae Lal Fig 128 Wiring diagram for testing the generator as a motor G Generator V Voltmeter 30 V top reading A Ammeter top reading Battery should supply slightly more than 24 V as current is 7 A 83 Checking generator output constant voltage ampere LLL SL ji 3 H 4 H P i 3 Hj 2 i i i Di 1 Lt H oL 1 1 lj 1000 rpm Fig 130 Output curve of generator type R 115 140 24 1600 Var 2 when warm Cut in speed at 24 V 1200 1400 R P M 51 57 qutm Por c E o Z a N T a i I Fig 131 Wiring diagram for the output curve plotting amp re versus R P M at a constant voltage of 24 V M Generator actuating motor G Generator V Voltmeter 30 V top reading A Ammeter 20 A top reading Temperature test 84 The outpul curve shown in Fig 130 has been obtained with generator heated afier a period of operation Therefore before plotting the characteristics mount the generator on the test bench according to diagram of Fig 131 run it through a motor for about 30 mi nutes af 2000
29. and current regulator contacts b control voltage rising because out of control b voltage regulator contacts stuck because of self welding contro current rising because out of control C current regulator contacts stuck because of self welding d control voltage very unstable particularly at d temporary sticking of the voltage regulator high generator speeds contacts Paragraphs a b c concern the control resistance paragraph d the damper resistance 103 If still in doubt replace these resistances which are fixed to the base by rivets Drill the rivet head first then drive the rivefs out with a punch paying attention not to damage the wires soldered to the plates 12 and 13 Fig 149 To prevent the current regulator core from rotating while removing and refitting the resistances use tool A 127050 as shown in Fig 157 The new resistances shall be fastened down with the screws spring washers and nufs specitied for the replacement The value of the control resistance 8 is 136 to 144 ohm that of the damping resistance 10 is 60 ohm Check that the air gap between the armature and the expansion edge of the current regulator core at position 0 0 of Fig 149 is 0 99 to 1 11 mm 0 039 to 0 044 To correct the air gap use tool A 127051 on the fixed contact support 4 fig 152 and check with a magnifying lens if the contacts are aligned correctly The gap between contacts of the cut out relay should be 0 4 to 0 76 mm 0
30. as resistances should be kept into suitable containers which prevent their being damaged deformed smeared by grease or foreign matter etc Fig 146 Regulator group bottom view 1 2 Screw and nut fastening the resisiance 3 4 Nut and cup fastening the cut out relay 8 Nut fastening the voltage regulator 6 7 Nut and cup fastening the current regulator Note Most failures especially the important ones such as excessive wear or cut out relay contact sticking oxidation of voltage and current regulator points burnt or fitted points short circuited coils coil burning may be due to causes originating outside the regulator group and chiefly to generator misfunc tion as for example to field winding resistance alteration impaired circuits cables etc Therefore the operator should make the group operate correctly but In addition extend his checking to the generator and to the charging system S Fig 147 Regulator group up to No 058017 as seen from cut out relay f Terminal tube 21 for shunt winding end a8 Terminal tube 51 3 Terminal tube 30 94 Fig 148 Regulator group up to No 088917 as seen from voltage regulator side 1 Terminal tube 31 2 Terminal tube 51 3 Terminal tube 30 4 Connection from current regulator to voltage regulator 5 Current regulator series winding end 6 Connection of regulator to the adjustment resistan
31. axle Operations and cautions Disconnect the following components the hydraulic pump ail lines the steering shaft lever longitudinal lie rod the board from the battery support and this support from the gearbox case the accelerator pedal tie rod from the transmission shaft the electric cables central connection fit two wooden wedges on the front axle attach the engine assembly fo a lift and place the gear box case on a stand remove the screws assembling the engine lo the gearbox and facilitate the removal by actuating the clutch pedal Note To pull the flywheel inner pilot bearing use foo A 619027 53 i i i i i i rr a e ee exp Fig 84 Stripping of clutch on device A 711083 A A Disengagement fever adjustment nuts 1 Elastic pins 2 Lever pivots 3 Forks 4 Fork adjusting nuts Stripping of clutch Inspection of clutch dismantled parts Fig 85 Front view of a tie rod dnd orientation of elastic pins See the last figure for references Mount clutch on fixture A 111063 or on fixture A 111063 A remove ihe elastic pins 1 Fig 84 and push out the disengagement lever pivot pins 2 By slackening the stud bolts fastening the clutch to fixture all parts become free If the clevises 3 must be removed unscrew them from the pressure plate after slackening the adjusting nuts 4 Check the clutch components as follows according to the data of ta
32. correct tooth bearing Fig 111 pay attention at pinion assembly to the number stamped upon the smaller base and marked by or this is quite necessary to determine that thickness of ring Rb which will be most fit to avoid noises dur ng operation We suggest the following sequence mount the bevel pinion shaft fitted with all its parts and with a ring Rb of any thickness mount on the casing the tool A 137010 according to Figs 12 and 113 rotate the tool shaft clockwise so that the eccentric zone contacts the pinion base and read on the quadrant graduated from 92 to 94 mm 8 622 to 3 700 the value at which rotation stops if this value indicated on the quadrant exceeds the one calculated by adding of subtracting from the theoretical distance existing between the pinion smaller base and the bevel gear axis 93 mm 3 661 the number marked on the pinion not preceeded by any letter mark if will be necessary to replace ring Rb The ring to be mounted should have a thickness increased of an amount equal to the difference between the two values On the contrary if the value read on quadrant results less than the one read on the pinion after adding or subtracting according to the or sign from 93 mm 8 6614 the thickness Rb should b decreased Example No 1 Reading on the tool quadrant 93 4 mm 68 Measure read on the pinion 62 mm Distance between pinion and bevel gear 93 0 2 92 2 mm 3 6614
33. eta eb yA el ee E X s vr 2 938 1 64 847 1 BthU8BT acoso a tta a e i ST pO Mose ge d E deor a 1 625 1 35 873 1 GIN Qe an 4s usta uta enean e OW ET Der i 1 032 1 22 188 1 ist reverse we a Le i 7 263 1 166 340 1 ANG TOVERSE 2 gne e aaan gei rem ui Y uo Pesta ate ay 2 1 44 151 1 Pear reduction train Bevel gears ratio ee ee ROY ae SIE S A ism idu S dX ead e e don 3 9017 1 Elna GUS Nate esis e sos a Ph E QV a t ML a RE RA AS 5 636 1 Total reduction ratio bevel gears and final drives 4 0 LL LLL Lll 22 078 1 TIRES 615 100 815 103 i Tractor type E E E 41 R 421 R Size of front tires ay n oa aa Ea E E e LL A 8 00 16 5 50 16 Max inflating pressure of front fires 5 00 LL i 2 5 kg cm 2 8 kg cm i 35 p s i 38 p s i i SIZE OF Tear tres nes Soo oes eni rp IS Ded 11 28 11 2 28 j field work aaua agaa i 0 8 kg cm 0 8 kg cm A 7 11 p s i 11 p s i Max inflating pressure of rear tires jroad work uuu 1 2to 1 5 kg cm 12 to 1 5 kg cm H 17 to 21 p s 171621 p s i STEERING SYSTEM Turning radius 5 2 2 22 2 o le eee 3 m 9 ft 10 in 2 8 m 8 ft 2 in BRAKES I Outer diameter of drums ee ee uuu 2100 mm 825 2100 mm 82 Width of brake lingo o Loc esses eL LLL 80mm 2 50 mm 2 i DRAWBAR 6 Horizontal swing of drawbar clevis Lu 660 mm 28 660 mm 26 i MET minimm 270 mm 105 200 mm T Height of drawbar clevis ab
34. eue oT SENT ENGINE PACED BS Qoo Gmi TS wheel tractor SERVICE MANUAL SECOND EDITION Service Department Via Canaprili 3 tupinigi Torino italy Form No 6023 54 68 Apri 1563 2000 S A N Torino ens S uonposs peuripnyBuo uomsnusuz44 19 Bid 52 P TRANSMISSION ASSEMBLIES CLUTCH The master clutch assembly is composed of two dry single plate clutches one for the tractor transmission drive and the other for the power take off drive The unit is controlled by one single pedal which during the first part of its travel disengages the main clutch transmission and tn the following one the power take off but only when this attachment is directly driven by the engine independent power take off The three diagrams of Fig 82 illustrate respectively a the clutch engaged 6 the main clutch disengaged c clutch completely disengaged Clearance Mo clearance Fig 82 Clutch functional diagram a engaged clutch b main clutch disengaged clutch completely disengaged c Power take off driven plate C Gearbox driven plate P Lever points Removal and stripping of clutch Removing the clutch assembly from tractor Parts to be removed The batteries The exhaust pipe The engine with the front axle Fig 83 Fig 83 Removal of engine with front
35. knuckles ihe front wheel hub cover and the front wheel hub with chassis grease SPECIFICATIONS ASSEMBLY CLEARANCES AND PERMISSIBLE WEAR FRONT AXLE COMPONENTS i Axle hinge pivot bushes and steering knuckle bushes shall be mounted 0 0020 to 0 0091 in H i F i 2 Wear Data Assembly clearances mm in o limits mm in mm in 2 E ie Axle hinge pivot bush inner diameter i dimension to be obtained after ped d puta i bush press litting i i Between bush and front axle 0 25 to 0112 0 35 Pee hinge pivot 0 0010 to 0 0044 0 0138 Axle hinge pivot diameter 31 975 to 32 000 i i 1 2589 to 1 2598 i i Minimum Axle support thrust ring thickness 3 10 to 3 25 e thick i t ness 2 0 1220 to 0 1280 i 0 0787 Steering knuckle bush inner diameter i i dimension to be obtained after aise 5 ie i bush titti d d i i meni prosecuting C Between bush inner diam 0 025 to 0112 0 36 m E eter and king pin 0 0010 to 0 0044 0 0138 Steering knuckle pivot diameter i 87 978 to 38 000 i i 1 4981 to 1 4661 1 i i Axle thrust bearing cup thickness 0 91 to 1 09 Minimum 0 0358 to 0 0429 thickness 0 6 i 0 0935 a m Sit on ee s 3 Axte hinge thrust bearing thickness i 3 925 to 4 000 Minimum 0 1545 to 0 1575 thickness 3 0 1181 into their seats with an interference of 0 05
36. lower covers and unscrew the screws NV Fig 118 remove the pedal springs remove the adjustment rod ends B from outer arm and slide it out remove the braking band end pins from the inner control arm Z Fig 118 and take them away Check the brake pulley surface and if necessary turn it down avoiding taking deep cuts which would impair its resistance check the differential axle seals for oil leakages correct any leakages smearing the ferodo lining replace bands if soaked with oil using tool A 517007 for riveting in addition check the shaft and pedal bushes for wear Fig 118 a and b Make sure that ihe screws V Fig 119 are fastened by wire to ihe internal levers S Fig 148 screws are facing the tractor rear end if not ihe external levers T have been interchanged and no braking action would be possible when mounting final drives avoid damaging the differential bevel gear support seal with the differential axle end Fig 119 View of brake bands and controis A Clevis locknuts B Caps R Brake band centering screws T Outer arm V inner arm screws When mounting brakes on tractor unscrew the two nuls and compleiely screw on the brake band centering screws R Fig 118 then unscrew them through a complete turn and retighten the nuts slacken nuts A and unscrew rods B Fig 119 until the free travel of each pedal is taken up then screw them again two tur
37. spy light the starter and the glow plug circuits are without fuse protection Find the cause of fuse failure prior to replacing a fuse 82 el da AME GU SM GENERATOR TYPE R 115 140 24 1600 Var 2 Specifications PULLEY Fine 64 730 GD 106 m m Fiat generator type R 115 140 24 1600 Var 2 see fig 128 having the following specifications has been mounted up to engine No 005044 it has then been replaced by generator type DC 115 24 7 3 C Maximum continuous output 24 V o uaaa ee ee ee 140 W Maximum continuous current output Amp re limitation at 28 VV 4 75 5 25 A Speed at maximum continuous current output at 24 V and 20 C 68 F 1400 1600 R P M Maximum continuous speed 2 2 2L Lvl 4000 R P M Excitation oe LL shunt clockwise A3 140 24 Fig 128 Sectional view of generator type R 115 149 24 1600 Var 2 1 Radial brushes 2 Field coils 3 Pole shoe fastening screw 4 Pale shoe 5 Driving side support 6 Frame 7 Armature 8 Commutator 9 Lubrication wick 10 Lubrication chamber 11 Field coil terminal Bench testing the generator Test generator efficiency according the checks listed hereafter Generator should always function coupled with regulator type 3 149 24 Generator tested as a motor The arrangement consists in connecting terminals 67 and 81 short circuited as shown in Fig 129 enerator shall be fed as an electrical motor at 24
38. to 0 23 mm 79 Bleek E7 WW 1 H i i i i DU Yetow and Black E i Grey i Green i I i i i i i i i 3 iia i goe and Black i eee Soa rat mae ti i i H E j FE gate es i FPT FR f i i Fig 127 Electrical diagram ot tractors series 400 i G Generator M Starting motor C Glow plugs B 12 V Battery A Horn optional PA Horn button FPA Horn i fuse P Headlights with a 50 45 W bulb GR Contro box PC Fuse box FPG Control box fuse LS Battery charge i warning light FC Deshboard lamp CLA Lighting and starting key switch CA Starting lever switch FP Right tailight FPT Combination number plate and left tail light GP 2 pole socket PR Rear lamp optional 80 RR ELECTRICAL SYSTEM DESCRIPTION The tractors belonging to the 400 series are equipped with a 24 V system including generating starting and lighting units The diagram of Fig 127 includes No Fiat generator type R 115 140 24 1600 Var 2 140 W replaced by a generator type DC 115 24 7 3 C starting from engine No 005045 up No 1 Fiat control box Mod A 3 140 24 replaced by a Mod GP 1 2477 unit CAUTION The control box Mod A 3 140 24 may be used with both generator types whilst the GP 1 24 7 unit must be used with generator Mod DC 115 24 7 3 C only See details in the respective chapters No No
39. voltage ranging within pre determined limits calibration limits not harmful to the battery for all the charging range which requires an output below the maximum values from the generator equipment and battery The maximum power is reached at the operational limit between the two units current and voltage regulators and is also known as peak load 87 The damper resistance coil 10 protects the voltage and current regulator contacts from the sparking deriving from the electromagnetic energy of the field coils during the opening cycles by grounding part of the energy n 5o QD ZR When the generator slows down to a point where its voltage is lower than the battery voltage a reverse current is produced from battery to generator This reverse current will go through the series windings of the current regulator and cut out in the opposite direction No consequences will derive to the current regulator as the current is not strong enough to pull the armature but it will demagnetize some what the cut out relay which has the contacts closed so that as soon as the reverse current will reach a certain value the armature will be released causing the contacts to open and consequently discharging from battery to generator will be prevented Finally note the functional importance of the bi metallic blades which together with the steel ones make up the fastening hinges of the armatures 1 Figs 149 a
40. with a winch remove bolis connecting such two components and disconnect them by a lever Remove the rear wheels and their discs To help the disassembly of the various units remove ihe mudguards The seat should be removed to facilitate the oper ations which follow Remove ihe differential case upper cover and set the power take off control levers at the position MOTORE engine Unscrew the rear cover fasiening screws and remove the cover by pulling and lowering it very slowly to allow the removal of the front bearing of the power take off shaft from ifs housing Fig 106 Transmission casing mounted on rotary stand ARR 2204 The differential lock control Differential gear casing supports Fig 107 Lock control spring mounting using tool A 287033 On top the spring is represented before assembly A and after assembly B on the tool Ai the same time remove from the upper opening the gear which is thus free from the shaft end to avoid damages from its falling in ihe box Note 7o easily disengage the rear cover from ihe transmission casing set the power take off engagement lever in ihe MOTORE engine position To inspect or replace parts remove the rear cover the pedal complete of attachment the plug from the shaft left end in order to make it possible ham mering it out from the right side Fasien the casing on support ARR 2221 mounted on rotary stand ARR 2204 Fig 106
41. 5 000 to 24 942 j i axle 0 9843 to 0 9820 f i Safety i Control n Valve spring specifications cylinder Hity i Discharge Free lengi 36 46 i 22 Pree length 5 uu LA T 2 5 0 Rm in 1 42 0 82 0 87 Te i 27 20 10 Compressed length 0 222 uu mm in 1 08 0 79 i 0 40 T 25 to 29 1 8 to 2 2 i 2 3 to 2 8 TeSbioad sca O E EE kg Ib 55 to 64 i 4 to 48 f 6 to 5 7 Opening pressure of relief valve 1 Fig 186 marked worh letter C or E 145 to 155 kg cm 2062 to 2205 psi Opening pressure of cylinder sa ety valve GG Fig 188 185 to 205 kg cm 2774 to 2916 p s Discharge valve 4 Fig 188 to control valve body wrench torque 9 to 10 kam 65 to 72 fi Ib Cylinder safety valve 3 Fig 186 wrench toreue 2 aa 4 to 5 kgm 29 to 36 ib L C Bushings are fitted into their housings in the lift casing with an interference of 0 020 io 9 102 mm 0 0008 to 0 0039 in C Bushings are fitted into their housings with an interference of 0 05 to 0 23 mm 6 0020 to 0 0001 TP h de ake b die 1o fii IE Mt Rehal valee c fReliel yalve 1 FG iet 9 6 10 Agm 65 5 72 6 Ub Emend oe eee i ylinder 5 fa 184 4 be 8 hgm t xt Al HYDRAULIC LIFT SYSTEM FAULT TABLE FAULT POSSIBLE CAUSE ATTENTIONS REQUIRED Lift fails to operate Lift jolts Lift does not hold the load in raised position when the engine fs on oscillating up and down when the engine
42. 6 Diameter of arm control shaft at bush 54 970 to 55 000 0 0039 to 0 9076 __ ings right end 2 1642 to 2 1654 i 46 975 to 47 000 teft end 1 8485 to 1 8504 Inside diameter of bushings for rocker 12 016 to 12 059 B i support lever press fitted bushings 0 4730 to 0 4746 i Inside diameter of bushings 0 016 to 0 086 0 15 NES CEAHED ki ER end the diameter of the i 0 0006 to 0 0084 0 008 i i Diameter of draft control lever pin 11 973 to 12 000 lever pin 0 4714 to 0 4724 nus CN REN i ore sag pea nen Inside diameter cf roller and lift control 12 082 to 12 075 i lever bushings press fitted 0 4787 to 0 4754 Inside diameter of press 0 032 to 0102 025 DENS E E S fitted bushing and their 0 0013 to 0 0040 0 010 i pins i Diameter of roller r Fig 190 b lift 11 973 to 12 000 control lever L Fig 182 pins 0 4714 to 0 4724 i E es xm _ Thickness of friction discs for lift 2 Contro lever 0 079 i a _ ____ a a NEP rnc Se Mi Thickness of spacer for lift arm run 0 45 to 0 55 ia adjusting screw 10 Fig 186 0 018 to 0 022 Inside diameter of bushings press 25 072 to 25 020 fitted Into the upper fink bracket 0 0 8871 to 0 9851 i E Bushings and upper link 0 020 to 0 130 0 5 i i bracket hinge axle 0 0008 to 0 0051 0 020 y Diameter of upper link bracket hinge 2
43. 6 84 89 A 711108 jaMeneba Sod a by bh WB the ue Wigs Fe ta Cena sie t 66 k A 711200 Spring tester A tnodo m Wen s a eu 14 A 735008 Puller steering arm 7 78 A 928254 Driver gearbox 1711 59 A 950703 Driver gearbox ET 59 ARR 2204 Rotary stand medium size 2 ES 58 65 70 118 96 106 ARR 2216 Rotary stand large bize 5 0007 4 45 ARR 2221 Stirrup set for rotary stand ARR 2204 65 70 ARR 117004 Stirrup set for engine installation 8 45 ARR 117005 Engine Hng hook sos e eu ee 5 8 3 C amp 80 Dial gauge with stand 2222552110 0100 09 20 i C 687 Dial gauge set 11 C TM Gauge blocs nea RIDERS AE i 20 C 197018 Go no go GAUA e NR 4 Rie ee SEE eo Y gy lop 127 C 817023 Fixture connecting rod alignment check 177 20 C 619012 Ring cauge for Setting dial gauge C 687 25157 11 18 i 495005 Bench hydraulic lift ow uos 125 U 0321 Reamer reverse shaft bush 81 U 0337 A B Reamers set engine 14 i U 217017 Espansion reamer 17 18 i U 313030 Reamer valve guides i 14 U 323034 Reamer pump rack bushing 37 U 6tista Expansion reamer 66 i U 614915 Expansion reser 2 1 1 177 Pr V Man haved 74 i 131 i i i i i i i Fig 195 Front and side view of tractor 411 R i SPECIFICATIONS ENGINE TYPE bonne bx keel Geiss vase rupi Pune 615 000 Diesel 4 s
44. E d ded OE Me Meenas S 750 kg 1 650 Ib thy gedl hl ous Bes Ro DAR seem ede Y eres a SOLA 450 kg 1 000 ib Wheelsiip is limiting factor ELECTRIC SYSTEM Running at 24 V See page 81 for instructions on its components ACCESSORIES The performances of the accessories power take off belt pulley hydraulic lift are the same for the several types of tractors Power take off Diameter on shaft aser be magn EA Oe goed wale ae o e ek bb P Speed of live power take off at rated ONGRIA Speed oos ne au er e eo xr dob 575 R P M Revolutions In ground speed 2 2 LL 1 revolution for approx 1015 of forward travel 27 em 135 Belt pulley Pulley speed at rated engine speed 0 L 1195 R P M Belt spaed ue dos ed qu o A a 15 6 m s 3 070 Fp m Diameter of pulley 250 mm 9 Width of band ln PC oie shah eter ewe ale ia 150 mm 67 Weight of pulley without lubricating oil 26 5 kg 58 th Hydraulic gear pump type ee L 2L LL LL Lun Plessey C 18 x Reduction ratio between engine shaft and hydraulic pump drive shaft speed 4 162 1 Pump speed with engine at rated n n MO LL EC 2000 R P M t y at Okg sQem 0psi lng aaa 17 litres 2 75 Imp al Delivery Ol atapprok B0 C eMe EY ene gem os pad ils uc 16 5 litres tu ieee Relief valve opening pressure Marked with letters C or E 150 kg sq cm 2100 p 8 i Bore of hydraulic lift cylinder 2 LL LLL LY 85 mm 3 34 Displacement eee ee ee
45. MER essa eve Nee zai yao lc 0 89 to 1 11 mm 0 039 tc 0 044 in Resistances Fig 138 regulation resistance 8 l ga aaa LLL 136 to t44 ohm damping resistance 10 2 00 00 0 60 ohm additional resistance for voltage regulator 7 73 to 77 ohm additional resistance for cut out relay and current regulator 4 0 0 00 i 78 to 77 ohm Note The generator check and adjustment spesd is 3500 r p m See data for modified groups under the following heading CONTROL BOX TYPE GP 1 24 7 MODIFIED Dwg no 4985433 The modified control box 4085433 differs from the previous type 4055883 as follows the series and parallel windings of the cut out relay are mounted in succession instead of being super imposed the value of supplementary resistances for the voltage regulator 7 Fig 151 cut out relay and current regulator 11 Fig 151 have been lowered from 73 77 ohms to 56 5 to 63 5 ohms These resistences together with those placed under the base of the control box are not furnished as spare parts 107 i i BATTERIES Specifications and dimensions Tractors are equipped with two 12V batteries capacity 56 Ah measured at 20 hours discharge connected in series fo reach the generator voltage of 24 y The main battery characteristics are 1 Connections covered with mastic insulating material io prevent current dispersions and pro tect against corrosion the connection
46. R P M The current output 5 5 5 A ai 28 V should be sup plied by a rheostat Stop generator and disconnect foad rheostat Rotate generator gradually increasing its speed until ihe volimeter reads 24 V then measure the generator speed Such a speed represents ihe cut in speed hot con ditions and should lie between 1230 and 1360 R P M points on abscissa diagram of Fig 130 Stop the generator insert ihe load rheoslat and maintaining constant the vollage check against the various speeds the current values included in the cross hatched area of diagram in Fig 130 Diagram ploiting should be made rapidly when generator performance is beyond its rated output and therefore overload might damage it a Fig 132 Diagram of connections fo check generator heating M Generator actuating motor G Generator V Voltmeter 30 V top reading A Ammeter 10 A top reading The regulator group to be coupled to the generator should be of the A 3 140 24 type if in doubt as to the maximum temperature of the generator during operation mount it on ihe lesi bench with pulley and regulator group according to diagram of Fig 132 Run generator during 45 minutes at 2000 R P M and during 15 minutes at 4000 R P M supplying to a resistor a current of 4 95 to 5 55 A at 28 V Overheating measured by pyrometer should be on generator frame 459 C 1139 F or less on commutator 909 C 1949 F or less
47. S Steering box bush inner diameter Steering roller shaft diameter Cover bush inner diameter atter press fitting Steering control roller shaft diameter Upper bush Inner diameter of steering transmission lever Steering transmission lever pivot diam eter Section A A Fig 126 Wear and levers inner diameter of lower bush of steer ing arm Steering arm pivot diameter Drag link bush inner diameter Drag link pivot diameter Data des mm in Assembly clearances mm in Eum H li i i i i 34 925 to 34 950 i 1 8780 to 1 8760 i Between steering roller shaft 0 025 to 0 075 0 15 i and its steering box bush 0 0010 to 0 0030 0 0059 34 900 to 34 875 1 8740 to 1 3780 i Z z m i i 34 912 to 34 987 1 3745 to 1 3755 i E 3 Between steering roller shaft 0 012 to 0 062 048 p i and its bush on steering box 0 0005 to 0 0024 3059 84875 to 34900 COYS i i 18780 to 1 3740 i epum ers 28 020 to 29 072 1 1425 to 1 146 Between upper bush Inner diameter and ihe steering i 0 020 to 0 105 0 35 transmission lower lever 0 0008 to 0 0041 0 0188 28 967 to 29 000 9 pivot 1 1404 to 1 1417 T 38 025 to 38 087 1 4970 to 1 4995 een beni i 1 eiwee ower bush inner i diameter and the steering Porra 15 d 020 idia 37 961 to 25000 8M lower pivot 4 4945 to 1 4961
48. S Arms lifting The control spool P is rotated so to let oil pass from the pump onto the top of the liit contro valve plunger 2 ensuring its closure The pres Surized oll can thus flowin to the cylinder through valve 5 and dispiace the piston to lft the arms F Arms floating As soon as the piston moves the control spool P rotates being connected tc the Inner arm through levers F E D The spoo rotational mov ement causes the oil under pressure which kept the valve 2 closed by pressing on its top to discharge Into the reservoir through the groove machined along the spool axis The Pressure af the oil coming from the pump and acting on the bottom of the valve wins the resistance the valve opens and the oil flow is conveyed into the reservoir Instead oi the cylinder A Arms Lowering 15 power the arms the valve spoof opens by cam action the discharge valve 4 which allows the oil to outliow towards the tank under the pres re of piston Fig 176 Working diagrams of the hydraulic System for different arm positions Note The oil flow pattern in the circuit is identical both for position and draft control operation 1 Pressure relief valve 2 Control valve 3 Cylinder Safety valve 4 Cylinder discharge valve Cylinder intake valve D Link E Rocker F Yoke link P Control spool 8 Pivot points h Groove along the control spool axis for off discharge when valve 2 opens
49. ad to remove the belt pulley transmission cover if mounted fo simplify the assembly Th Mount the assembly on rotary stand ARR 2204 the see Fig 167 the the Th Fig 167 Cover rear transmission with power take off mounted on rotary stand ARR 2204 Mz Di Fig 168 Power take off assembly stripped A Driving shaft components B Driven shaft components 116 Dismantling See A B Fig 168 representing the disassembling sequence of ihe various components from their seats Inspection of components Check gear teeth and shaft and hub splines con ditions The power take off driving shaft sliding gear can be chacked and also disassembled by removing the transmission casing upper cover Check the bearings for smooth running and the power take off driven shaft oil seal conditions See page 118 for main assembling clearances ang permissible wear limits Assembly Reverse the dismantling sequence Note To fit the power take off driving shaft into the sliding gear hub turn the power take off driven gear by hand ats Ata a ASSENTIOR tet Ma DN dta AC Mr tarde tT t t BELT PULLEY The belt pulley assembly is mounted in place of the power take off cover Fig 81 and may be set with the pulley either on the right or lett side according to the required direction of rotation the vent should be mounted on top and the drain plug at bottom Fig 168 the position of the parts The unit is c
50. ance shunted at 209 C 689 F should be of 1 to 1 14 Ohm Electromagnet coil resistance The electromagnet coji resistance at gpe c 689 F Should be of 1 36 to 1 46 Ohm Mechanical characteristics See data on page 115 Guide for finding Starfing motor troubles Faults in the charging system May be localized either in the electric motor or Somewhere else in the system it is therefore Necessary to localize trouble first in order to avoid a waste of time by looking for faults in the electric motor not being there or due to outside causes so that repairs would be useless as trouble would repeat itself Therefore if Cranking is very slow or absent the defect must be localized To this end as engine is stepped the headlights can be used Comparatively Scarce illumination can be traced to fow battery charge damaged cables or terminals not tightened Naturally the check is made taking for granted that the headlight circuit and its components are efficient and without tension losses for poor contacts at the switches bulb sockets etc It happens less often that the recharge plant is defective and this may be ascertained through the regulator Checks Anyway the battery recharge without having found out the causes will not eliminate the trouble that will repeat 111 The battery being normally charged and the starting motor operated causes the following headlight behaviour 1 No light traced to poor connections between batt
51. ator shunt winding does no longer get across to the generator but remains insulated Therefore as the flow of current is interrupted the core cannct pull the armature contacts do not open and the voltage out of control rises 104 The resistance value is 73 to 77 ohms at 20 C 58 F If the cut out contact closing voltage is found to be low or the contacts remain open even at high generator speed check the resistance 11 Fig 158 to ascertain whether the cause must be attributed fo altered value or to an interruption of the wire Fig 159 Bottom view of the contro box GP 1 2471 6 Regulation resistance 7 Additional resistance connected to the voltage regulator winding 10 Damping resistance shunted across the genarator between current regulator and ground 11 Additional resistance for current regulator and cut out relay shunt windings 30 Electrical equipment terminal 81 Terminal connected to the positive pole of the generator 87 Terminal connected to the genarator field winding In case of a coil short the value of the resistance decreases while the current regulator and cut out relay shunt winding absorbs more as the resistance is connected in series to these windings and closes the circuit to ground that Is it creates a greater pull on the armatures particularly on the cut out one where the magnetic effect is greater and therefore the contacts close at a lower voltage Should the resistance w
52. ator voltage increase resulting in the re opening of the contacts The cycle repeats itself and an oscillation of the armatures is maintained to keep the voltage within the setting limits The function of the acceleration resistance a is to increass the oscillation frequency of the voltage regulator which reduces its pull on the armature 2 In fact as the contacts open the field winding current going through the acceleration coil creates a magnetic field which is subtracted from the one created by the tegulator shunt winding and therefore reduces the magnetic pull on the armature favouring its release Should current consumption exceed a certain limit or the battery be discharged a great current output will be required fr m the generator this current induces a magnetic pull on the current regulator armature sufficient to close it against the action of the springs The contacts open and insert through the generator field winding circuit the regulation resistance and the acceleration coll with the same resuits described above in the case of the voltage regulator in this case it is the current which is con tained within set limits If the current output requirements remain above said limit the current regulator armature keeps on oscillating substituting the voitage regulator one which remains at rest To conclude the current regulator limits the maximum current output of the generator whilst the voltage regulator ensures through the System a
53. be required Armature checks are to be made with the instruments illustrated In Figs 134 and 135 Fig 134 Checking the armature with twin contact tool Fig 135 Checking the armature on the testing apparatus using a blade The interruption is located by the no indication of the ammeter Biade vibrates at short circuits 86 j i i Reassembly of generator After any repair or replacement and before reassembling the generator proceed as follows a blow away all dust chiefly carbon dust from all components using an air jet b clean brush holders and the commutator end bracket from grease and carbon dust d posits using clean commutator surface removing carbon dust between bars Avoid using e d a dry cloth mery paper or clot soaked with gasoline or solvents check brushes for play inside brush holders against the values listed below seross eleafdnes e sioe ite e E eau PE 0 5 to 0 3 mm 0 0039 to 0 0118 endclearance o ooa ga upade yraa aa 50 02 to 0 5 mm 0 0078 to 0 01977 e check brush Spring pressure which should be 69 to 76 kg 1 521 to 1 675 1b Ji T la service with high melting point grease the ball bearing the commutator and bracket bush and the recess at the end of the bushes 10 Fig 128 and replenish with oil SAE 50 HD the wick of the same bracket i he sequence shown in the chapter Covering disassembly should be reversed to reassemble
54. ble at page 51 check condition of friction linings and of metal surface if the rings are soaked with oil insufficient check clearance between the clutch driven disk hub feeth and splined shafts check the throw out bearing and the clutch shaft pilot bearing located in the flywheel 54 Fig 86 Clutch exploded view s contacting them if necessary smooth them replace them s washing in gasoline and surface brushing are check clearance between bushes and disengagement lever pins check plate spring characteristics check the throw out collar working sliding surface lf wear does not exceed the permissible limits the shaft can be mounted again after rotating it 180 if necessary replace the parts when grease drips due to excessive clearance Assembling and adjusting the clutch Lubrication Fig 87 Clutch section Assembling the clutch components Clutch adjustment Smear lightly the following components before assembling using quality chassis grease the clutch disengagement fever pivots the clavis ends contacting the disengagement fevers 3 Fig 84 the cluich gearbox and the clutch power lake off shafi splines the bail ends of push fevers P Fig 88 the clevis lever ends where contacting the disengagement collar in addition service the bearing housing in engine flywheel Fig 88 Clutch plate centering with reference to poin
55. can maintain their efficiency When discharged excluding after long tractor stops which cause battery self discharge the batteries indicate abnormal functional conditions These may be traced to 1 Faulty recharging system generator regulator group see service instructions 2 Current dispersion due to insulation defects in the electric system This may take place after heavy current draw due to the insertion of extra accessories A rapid check is made by inserting a microammeter between battery positive terminal and its disconnected clamp after having stopped ihe engine and excluded all equipment The current rate should not exceed 1 milliampere 3 Extra accessories in addition to ihe standard ones installed by the manufacturer are dependent upon the electric system capacity 4 Tractor short havis using high gears at low speeds and with frequent Stops To maintain the generator at its normal recharg ing speed rate use low gears when running at low speeds 5 Suiphated battery short circuited elements or interrupted No difficulty should be met in Insialling or removing the batlery from tractor to avoid heavy discharges be sure fo disconnect the grounding cable before working In addition use proper wrenches and never use pliers fo screw or to unscrew the terminals 108 STARTING MOTOR Specifications TYPE P I C A hee ws ee a a Sek ono 00 FIAT E 145 3 24 Var 2 Rated voltage ee ee eee LL pe
56. ce ESOS UR RET BRA DOR tra ao ra eg RAHA ACER TUE i i 1 Dismantling and reassembling of group Remove lead seals unscrew the nuts fastening the cover to base remove both cover and gasket and dismantle according to needs Unweld the coil termina s connected to other elements and unscrew the nut fastening it to the base When checking or reassembling such elements make sure that the setting screws are not being tampered with as during manufact uring they have been sealed with varnish For coil terminal soldering use exclusively a neutral flux avoiding acids Carefully watch the insu ating washer assembling Before reinstalling the group cover make sure that the open contacts distance of the cut out relay when at rest is 0 70 to 0 85 mm 0 0275 to 9 0334 for rivet type groups check the group insu ad between terminal 30 and the base Mount cover when group is hot to avoid moisture condensation after closing R Fig 140 and 1 15 to 1 30 mm 0 0452 to 0 0512 for non riveted groups ation by applying 500 V at 50 cycles between the magnetic coils and the base CHECKING AND CALIBRATION VALUES OF REGULATOR GROUP A 3 140 24 i Cut out relay Voltage regu ation when heated M M Cut out relay when Adjustment re when cold to 50 C 122 F on battery c
57. ce for the shunt winding fo the current regulator and cut out 11 the regulator resistance 6 connected in series to the acceleration winding a damping resistance 10 shunted to the generator field winding between the current regulator body and ground Operation At low speeds the generator voltage is not sufficiently strong to induce in the shunted windings of the control box units a magnetic flux apt to attract the armature to the cores Ali armatures are therefore at rest and the cut out contacts are open whilst the current and voltage regulators ones are closed 96 I i i As the generator speed increases the voltage and the current output increase creating a stronger magnetic flux when the generator reaches predetermined values of speed and voltage the magnetic flux becomes sufficiently strong to win the resistance of the tension springs and so attract the armature to the cut out core to close the contacts A current is then circulated from the generator positive terminal through the series windings of the units Fig 131 to the electric system equipped and positive terminal of the battery and returning to the negative brush of the generator The magnetic flux induced in the series windings is added to the one induced in the Shunted windings to hold the cut out contacts more securely closed As a rul
58. charge valve and of the lift control valve 4 2 Fig 188 grind the seats if necessary and check spring performance check the setting of the pressure limiting and Safety valves by means of a hand pump equipped with valve carrier A 197032 A B Fig 181 Hf data do not correspond replace the valves as component parts are not furnished separately as spares t4 Adal vake 2 33 T70 pi ac i 2772 6 AG pst aie I Cipit hs Fg S40 E Fig 183 Exploded view of the hydraulic lift 6 Piston t1 Oil filter components 12 Outside linkage 13 Rear cover with spring mounting lifting contro shaft 16 Inside arm with ram 17 Control 14 Inside linkage 15 Arms I unit 18 Barrel 19 Lift body 20 Breather Plug 21 Screws fixing linkage to inside arm Ty control cock 1 Pressure relief valve r Control spool Z Exploded view of the auxilia Power lift assembly Reverse the order of dismantling and follow closely the instructions given below when placing the inside and outside arms on the control shaft to register see Fig 184 the installation of the seal rings on the arms Tequires using the protection A 197003 A first in order to prevent contact with the teeth of the shaft end then the use of the punch A 187003 B Fig 185 the screw which fastens the control lever to the control valve spool Q Fig 182 should be mounted on the piston side make their resp
59. ction of rotation of pump shaft looking on drive side Bh d ef E cote clockwise Injection order Mg toram Pe a e a prr Re E Un ol hy Sontag 1 3 4 2 Setting of injection assembly on engine The pump assembly with plunger No 1 at the beginning of delivery is mounted on engine having piston No 1 n the com pression stroke Oe NN EEE PONE LLLI PEE 20 1 before T D C Ne Cee 8 eRe ne CC M TEE EM dE Mb KC 55 SBF od ARE eee oe Magic ame ee S 2 35 5 DN 12 SD 12 lupra lr rM EM KMS NE ae eek 2020 5 kg cm 1700 70 p s i Governor Vacuum governor embodied with the injection pump Ype a ad Lo els EP M 60 A L45 Max engine speed ne load not tess than 01015117777 2600 R P M Min engine speed o PM Mer PROC RE 420 to 480 R P M Lubrication Lubrication oil Pressure automatically adjusted by a valve with hot engine st normal R P M rate YEN EVA GS ite Nuls c i eE a Io 3 kg cm 43 p s i For tractors 411 R and 421R C Engines with 5 less power should be accepted 138 Starting Electric motor with engagement controlled by electro magnet type FIAT E 115 3 24 Glow plugs for cold starting 2 2 2L LL LL LV LL TRANSMISSION Gearbox ratios Overall reduction ratlos 1st DOR oo e oe ote oh po VAR EA oy TEREE 10 668 1 235 449 1 2nd GEAT dogs ue nr RO I vie ee d d RR eka D 5 801 1 130 276 1 Sri gest vo isl sot e P hoe Goalie de FUROR De ez Sor E DELE 3 149 1 82 758 1 4th Gear o Lis
60. ctional limit between voltage regulator and current regulator Important 1 The regulation group type A 3 140 24 should function only with generator type R 115 140 24 1800 and type DC 115 24 7 3 and derived The group shall never be used with a third brush generator even if of size corresponding to the generator prescribed above the elimination of the third brush would not change things even worse it would be to connect a third brush generator as if it were controlled by a regulation unit The reason is that both groups and generator circuits mainly the field coils of the generator that are so reciprocally arranged as to get the best performance for the whole combination i D a up to group No 088917 b from group No 088918 Fig 141 Regulation unit type A 3 148 24 electric diagram As group is at rest with generator running at low speed the voltage regulator and current regulator contacts are closed whilst those of the circuit breaker are open 91 ANN i j 30 7 LI TI i 1 lt 28 T i 1 57 Pd MEN fap i i pb 25 Pos 1 i toi d i 1 24 i 22 L o i 2 3 4 5 6 A o 2 3 4 2 Characteristic obtained as
61. d exceed the set limits and the battery would be compelled to absorb a very strong current resulting in excessive electrolysis and consequently wear of plates insulators etc when room temperature is low the voltage would be scarce and could not ensure a correct recharg ing rate Also in the current regulator the bi metallic blade 1 Fig 152 which is part of the spring hinge of the armature is so disposed as to gradually reduce the tension as temperature rises But as explained above regarding the other two units voltage regulator and cut out as the shunt winding temperature rises the current put across it decreases and consequently also decreases the magnetic pull on the armature When the unit is cold this results in a higher regulated current and when it is hot a lower current because of the bi metallic blade The bi metalllc spring of the current reguiator works as thermal compensation of the current going through it and determines the following advantages at the start or after an interval of about 2 hours from the last period of operation the control box is at room temperature that is not thermally stabilized and therefore as explained before the regulated current is higher than the maximum continuous permissible one for the generator and should the system require it the generator DC 115 24 7 3 E can be overloaded When the control box and generator temperatures rise the bi metallic blade reduces in about 20 t
62. d on the lifting arm shaft a three point implement hitch adjustable with a Screw controlled by a hand wheel on the right link allowing the cross adjustment of the implement position Fig 187 8 control valve optional to be applied in place of the control valve cover for supplementary attachment control Fig 193 HYDRAULIC PUMP Medef CI8X Plessey The hydraulic pump needs no maintenance checking or adjustment even atter long operation This is due to the fact that clearance between the gears and bushes is taken up automatically by the oil pres Sure in the pressure side The bushes have thelr side facing the delivery fitted with a fillet 1 Fig 173 which the oil Crosses through fo act upon a surface Tecessed on the two covers and defined by two rubber gaskets shaped as a heart and laid eccentrically 2 Pump general overhaul See Fig 173 for the disassembling and assembling sequence of the hydraulic pump components The explanations of the preceding paragraph shoutd facilitate a correct assembly and disassembling sense of rotation of the drive Shaft is indicated on the pump cover In addition notice that assembly and disassembly require no Special tooling as the high finish of machined surfaces would be damaged by a careless assembly Never disassemble a hydraulic pump original spare parts are not available if repairs are necessary entrust them to FIAT Service Organization 118 We give hereafter the s
63. de leverage placed as during work A Lift control lever B Selector lever L Leverage control lever P Control spool Q Screw securing the control lever to the spool R Screw securing the lever L to the rocker valve for auxiliary equipment Fig 180 Fig 183 shows the power lift subassembiles in the dismantling seguence and Fig 182 the outside lever mechanism above and the inside lever mechanism connected as they are during operation below Inspection of components disassembled from the hydraulic lift After dismantling the power lift unit check the following check conditions of the gasket between barrel and housing and between piston and barrel check the play between the arm contro shaft journals and the bushings if found exceeding the values Specified on the table of page 130 replace the bushings check that the play between the control valve spool and its bore lies within the specified limits Note that the valve spool is not furnished singly as a spare but always together with the valve block being fitted to the bore wash Ef replace the oil filter cartridge if found defective and make sure that the filter seat plug is well welded to the plate for cartridge protection to prevent aif suction on the part of the hydraulic pump replace the oil seals for the lift arms shaft and the gaskets cf covers plugs and valve seats if they are not dependable check sealing characteristics of the dis
64. ders are reduced compared to the radial typs For equal brush sections they allow a larger contact surface on the commutator thus reducing both sparkling and temperature the excitation current also is reduced and the regulator group contacts voltage and current regulators have longer life When the generator is coupled to regulator group GP 1 24 7 starting cold it may generate a current greater than the maximum one but it is reduced when the internal continuous running temperature has reached appropriate levels thermal equilibrium without any damages to the components The feature is due to the current regulator which as explained when describing the regulator group is thermostabilized Fig 136 Longitudinal and cross section of generator type DC 115 24 7 3 C Note bracket is fastened by screws not represented in the figure ic the generator frame Bracket must be required separately 88 iieri Therefore if required by the equipment inserted in the system the generator may be overcharged without any damage to windings in fact they are at ambient temperature at the start of operation and therefore are not yet thermally stabilized When after 20 30 minutes of functioning due to ohmic resistance the group and generator become stabilized the current regulator reduces the current to a value continuously possible The temporary overcharged operation of tha ge
65. e after the cut out is closed and the ge nerator voltage keeps on raising the contacts of the voltage reach the predetermined setting value As the contacts open due to the magnetic flux induced by the shunt winding and acting on the armature an acceleration winding a and the regulati n resistance 8 are inserted in the field winding circuit of the generator The regulation resistance lowers the current through the generator field winding and conse quently the generator voltage unti the voltage regulator contacts close again 31 f n Unc Fig 151 Electrical diagram of the control unit GP 1 24 7 nnn nnn rne curent across the shunted winding ofthe voltage regulator 10 Damp M H i i ing resistance 11 Additional resistance in series across the shunted windings of the current regulator and cut out relay a Accelerator resistance in series with the regulation res istance 6 B 12 V batteries connected in series 6 Gen erator model DC 115 24 7 3 and its modified versions 30 Electrical equipment terminal 34 Ground 51 Generator positive terminal 67 Generator field winding terminal 8 Regulation resistance 7 Additional resistance in series i Note The windings of the three elements of the control box drawn with light lines are shunted across the generator circuit those drawn with black lines are connected in series Then the field winding current and consequently the gener
66. e been modified in order to bring location of the varicus parts within the requirements of international standards Changes are as follows stronger and simpler frame 77 more adjustment possibilities in fact the drawbar plate can he fixed to the tractor at two different heights and ior each one it is furtermore possible to adjust the height by turning the drawbar plate upward or downard More vertical settings are Possible by turning over the drawbar the drawbar can be set on 3 longitudinal and on 3 traverse positions Besides the lower links are made 4 em longer and the PT 0 shaft 1 cm longer 138 i i i i i Fig 201 New drawbar and hitch assembly Specifications Vertical distance from ground line to top of drawbar at hitch point adjustable as follows 2 0 0 Horizontal swing distance at hitch point esu Roa ae eae te Horizontal distance between hitch point and rearmost point of 12 4 28 tyres adjustable as follows Horizontal distance between hitch point and end of PT O shaft adjustable Cite 4 e ey dA n Bins Hen Vertical distance between top of drawbar at hitch po nt and centerline of PT O shaft adjustable as follows Vertical distance from ground line to centerline of PT O shaft Diameter of hitch hole plus one 17 5 mm 11 6 hole at 102 mm 4 ahead of hitch hole el 318 376 438 mm 121 4p AT 510 mm 20
67. e ee LLLLILIIIE 500 cu cm 30 5 cuin Maximum travel of lift lower links gaua LL LL lll 580 to 600 mm 4 227 to 23347 Maximum weight raised at the end of the lower links 900 to 1200 kg 3 1985 to 2645 tbs Indicated lifting capacity ee eee ee LLL Lll approx 756 kgm 5425 ft 1b Lifting time with engine at 2300 REMO s bec pce oes vA veni ew 3 sec Weight of draft and position control hydraulic lift including pipes and pump without cil 82 kg 180 Ib C Starting from chassis No 424274 up specifications are as follows Mex travel of lt lower Iink on a Gaa e mea ie esni ea 550 and 650 mm 215 and 25 Max weight raised on lower link ends l 001 fotos or s or or s s s 900and 1200 kg 1985 and 2645 Ibs CAPACITIES H Part to be filled Quantity Material Cooling system 121 2f Imp gal Water Fuel tank 00 0004 391 812 Imp gal Diesel fuel Bn k filte d pi SAE 30 HD oil for temperature from 0 C 32 F Codon case filters and pipes 8 kg 7 34 Qts SAE 10 W oil for temperature below 6 C 32 F neuded eee aa SAE S0 HD oil for temperature above 95e C 059 F Injection pump and governor i Same oil as used for the engine sump Air cleaner 5 ee 98 Sle SAE 30 HD oil Transmission 0 00 2 1155 SAE 90 cil an 2 4 3j SAE 140 oil for temperature above 10 C 14e F Final drives each Ls 4 SAE 90 oil for temperature below 10
68. e hydraulic power lift can be equipped with a control cock unit in piace of the control valve cover in order fo actuate attachments controlled by hydraulic power cylinders both single and double acting This aifachment is not controlled by the lever which determines the raising and lowering of the arms but rather by a lever which is part of the control cock lever This makes the two operations indipendert 128 Fig 192 Top link Support bracket wedge Fig 193 Auxiliary oil reservoir installed on the left 1 In 2 Out fender and supplying a single acting cylinder f Breather 2 Filler plug with dipstick 3 Control cock from each other and allows using the same oil contained in the lift unit The two different types of operation cannot function at the Same time Should the application require more than 2 to 2 5 liters 1 3 4 to 2 1 4 Imp quarts of oil an auxiliary cil reservoir must be added Fig 193 shows the installation of an auxiliary oil reservoir with a capacity of 9 liters 8 Imp quarts for actuating a power cylinder with a max capacity of 14 liters 9 8 Imp quarts The auxiliary oil reservoir is connected to the hydraulic power lift unit through a tube fixed to the breather plug by means of a fitting The plug is then installed on the auxiliary reservoir Check all the seals before installing the reservoir to Prevent leakages due to the higher pressure head The control cock unit shown on Fig 180 a
69. ears having individual casings mounted laterally to the differential and driven by it Fig 110 Final drive overhaul The major overhaul thereof should be made as follows Remove the electrica cable energizing ihe rear lighting from connection and lake the mudguard away place the transmission casing on the stands and remove the wheel assembly with disc and tire Remove the final drive casings from the tractor and pull outwards to slide out the differential axle from bevel gear Removal from tractor Fig 114 Mount the assembly on the rotary sland ARR 2204 with support ARR 2221 and remove the brake drum fastening nut Remove the drum using a universal puller Fig 115 remove both final drive casing cover and driven gears remove the axle inner bearing stop ring see Fig 110 and push it out the casing Stripping out of components E m e Note The final driven gear removal does not necessarily require removal of the casing from tractor To unscrew the driven shaft nut of the final drive mount tool A 187014 to stop gear rotation Fig 116 then use a universal puller provided with 2 screws diameter 16 MB pitch 1 5 mm Fig MT Fig 114 Removal of final drive casing from tractor Fig 115 Removal of brake pulley using the universal puller 70 Fig 118 Final driven shaft nut removal Inspection of components Assembling Fig 117 Removal of final drive driven
70. eck the taper roller bearing and the differential axles oil seals check the differential lock collar working surface and the pin fastening Check the differential lock control spring Fig 107 by a comparison of its characteristics with the specifications on page 69 Differential casing assembly See Figs 108 and 110 and in addition bear in mind that the planetary casing is secured to the bevel gear by bolts fastened to a torque of 4 5 to 5 kgm 32 to 36 tb the differential pinion axle is held in place by two special head bolts the same which secure the casing to the bevel ring gear 66 Vestn Fig 110 Rear transmission sectional view Rc Ring gear shaft adjustment shims a Drive wheel shaft and spacer up io tractor no 408459 the assembly of the taper roller bearing inner N X uc races on the casing should be made after heating the bearings in an oil bath to a tem VERS perature of 80 to 90 C the same procedure ES applies to two bearings and to the power take ISS off driving gear on the bevel pinion sha t 2 y Fig 109 ZN the differential lock control spring is installed P as shown by the Fig 107 using tool A 287033 aF To facilitate the reassembling of the differential Fig 111 Bevel pinion and gear correct tooth hearing case to the gearbox we suggest placing very near io the shaft front ends by manoeuvering the
71. ective stamped marks Power lift adjustment The adjustment of the power lift should be carried out by placing the unit on the tractor or on the bench 1 495008 which is equipped with the necessary weights a Control valve Spool adjustment Run the engine to high idle speed then raise the lift arms and place the selector lever on Position control downwards Remove the cotter pin and slowly screw in the adjustment plug t Fig 186 until the load starts oscillating vertical oscillations unscrew the plug half a turn and fit the cotter pin 128 Fig 184 Register marks for fitting the inside and Fig 185 Liff arms control shafi seals fitting outside arms onto the control shaft HEBICBSAFTUS on S A A 197003 A Punch B A 197003 B Protection b Arms stroke adjustment Start the engine and check that the stroke of arm ends of the implement hitching device with the links connected in the holes as shown in Fig 187 is from 580 to 600 mm 22 27 82 to 23 5 B if the stroke length does not lie within the above tolerance act on screw 10 Fig 186 by means of spacers Note that when the implement hitching device arms are at their highest position there must be a margin left which Is controlled by raising by hand the lift arms c Adjusiment of ihe distance between the lift cover and strut support Whenever parts have been replaced spring strut support or lit cover or after a major overhaul check the follo
72. elding of the contacts it is therefore absolutely necessary to connect terminals bearing the same number keeping in mind that even if the wrong connections are corrected and the operation be comes normal again the useful life has been nonetheless shortened 3 The control bex should never undergo shocks of any kind particularly the lower side which houses the resistances Fig 159 During bench testing the box must be positioned with the terminals downwards and with an insulator lining between the bench mounting and the base 4 The grounding connection between the control box and the tractor must be secure otherwise there will be no regulation there being no current going across the shunt windings In this case the generator voltage output which increases with speed as it is not regulated will burn the winding ends and dete riorate the voltage and current regulator contacts due to the excess of current across the field winding of the generator Bench testing Instructions To check the performance of the control box mod GP 1 24 1 start with the ollowing operations without unsealing the unit place on the bench a generator model DC 115 24 7 3 regardless of modification A B etc connect the generator to an electric motor the speed of which can undergo fine variations over a wide range and provide a 30 V battery make ready the instruments and gauges necessary to the elements of the control box keeping in
73. ening the head to the frame 1 and the protection strip 8 free the field coil leads connected io the brushes and remove the complete head d Pinion end bracket Slide it out from the frame with ihe armature remoye the pinion engagement control fork pivot and pull upwards the fork fo disengage the pinion Free wheel Remove split pin unscrew the nut remove the pinion stop ring and slide ihe free whee out To strip the free wheel remove the spring cup stop ting and slide out components remove the ring fastening the wheel to the bell and carefully slide out the spindle to prevent rollers and springs from Jumping out Starting motor trouble shooting and component checks Brush replacement in the commutator is comparatively simple raise the springs and slide out broken or worn brushes Use only original brushes supplied by FIAT Sezione Ricambi which ensure a long service Check the solenoid contact which if oxidized or burnt should be cleaned using emery cloth then remove all metal and emery dust before reassembly lf necessary replace the solenoid and the starting motor field coils using original spares without attempt ing to repair them or to wind a new coil as good performance cannot be obtained by such means After having tightened the coils under the polar shoes check that the air gap corresponds to specifications to facilitate the assembly warm up the windings to about 50 C 122 F Check commutator fo
74. erial The distance in cases 1 and 2 of Fig 180 a can be checked using the two ends of the Go No Go gauge C 197015 d Adjusting ihe play between roller and sector Fig 190 b Move the lift control lever to the highest position in the sector slot to get full raising of the arms and place the selector lever in draft control upwards apply the lever A 197016 to the mounting holes of the strut to its support so as to completely take up the play existing between cover and Support at the lower stop in these conditions the distance between cam and follower should measure 1 5 to 2 mm 1 16 to 5 64 f necessary the distance can be corrected by rotating the eccentric on which the follower is mounted Note Should the working pressure of the lift hydraulic System need checking place a pressure gauge with fitting A 197035 in place of the safety valve as shown in Fig 188 1 Min 225205 i D i A s Fig 190 a Setting the clearance between lift cover and top link mounting brackat 1 Setting the clearance 14 5 to 15 8 mm 0 571 to 0 610 in between cover and top link support bracket spring M being free 2 Setting the clearance 22 to 23 mm 0 866 to 0 205 in between cover and top link support bracket spring M being loaded H Adjusting shims M Top link support bracket spring Fig 190 b Adjusting the clearance between cam and roller Clearance 1 indicated in sketches 1 and 2 of Fig
75. ery and motor or corroded battery terminals 2 Considerable dimming as engine is started and the latter runs slowly or stops a excess of oil crankcase density b armature spindle bent bushes and support worn and polar shoe screws loose C commutator damaged series field coil or armature coils grounded or short circuited 3 Bright headlights and starting motor cranking slowly or stopping a loose terminals of the motor solenoid contacts oxidized or Insulated by foreign matter intrusion or damage of the excitation circuit and commutators circuits b poor or faulty brush contact on commutator Trouble shooting instructions tem 1 of the preceding chapter increases the ohmic resistance between batteries and motor and may be measured by a volimeter when motor is running The voltage drop measurements to be taken are as follows between tractor body and battery negative pole between tractor body and the electric motor frame between battery positive pole and the solenoid terminal where the battery feeding cable ends Each measurement should not give more than 0 1 V when the starting motor is running However if the voltage drop is excessive disconnect the cables clean the battery terminals and smear them with vaseline to prevent corrosion Items 2 and 3 of the preceding chapter call for a commutator check for efficiency and the removal of the starting motor to perform its test with no load and when stopped torque te
76. exceeded 29 5 V the voltage regulator intervenes to reduce the generator charge all electrical equipment off When the battery is charged the delivery current is reduced to a few amperes to prevent excessive electrolysis overheating insulator damage IMPORTANT 1 The control box mod GP 1 24 7 must only operate together with the generator mod DC 118 2477 3 this limitation is necessary for two reasons a only the generators specified above can be overloaded at cold starting b the contro box has been designed to suit these generators and the field windings have been designed to suit the control box Should the latter be connected to a different genera tor the operation would be incorrect the settings would change the useful life of the contacts would be pratically shortened and the generator would soon be put out of use 2 An incorrect connection of the control box terminal No 67 with the generator terminal No 51 produces immediately a strong sparking effect which oxidizes the contacts of the elements of the contro unit if protracted longer it caneasily V xl Op i il pee 2 3 4 Fig 153 Regulation characteristics volt ampere of the control box model GP 1 24 7 on the battery curve plotted with data obtained at an ambient temperature of 50 3 C 122 37 F and generator speed of 3500 LPM 99 cause spark w
77. feed pump and pump till the fuel that flows from the holes located under said screws is free from air bubbles Retighten said screws FEED PUMP WITH BOWL TYPE FILTER The injection pump type PES 4 A 60 B 410 L4 6 features a feed pump fitted with bowl filter mounted out side the pump body f 198 and 189 Fig 199 Feed pump components 15 Fuel filter 187 The calibration with respect to previous pump type PES4 A 60B 410 L41 is the Same and the soj e difference concerns the fuel feeding Fuel filter cleaning should be done with petrol every 120 working hours and before reinstalling it tis advisable to check and to replace it if necessary After assembiy bleed air bubbles from the System by slackening the relevant screw locat ed on the injection pump body and by actuating the priming hand pump U FLEX TYPE OIL RING A U Flex type oil ring has been installed on engines No 016736 and above This type ring is higher than standard ones therefore the piston groove has been modified accordingly Said changes have also been made on engines from No 016266 to 016513 Modified dimensions are shown in Fig 200 Fig 200 Dimensions of piston ring and its groove 5 530 5 550 mm 5 480 5 510 mm 72 6 72 4 mm 0 2177 0 2184 in 0 2157 0 2169 in 2 8583 2 8503 in NEW DRAWBAR AND HITCH Starting from chassis No 429451 up the drawbar and hitch device of the series 400 tractors except mod 431 R hav
78. fines r nning from the hydraulic pump to the lift remove them The stripping of gearbox components is facilitated by installing it on the rotary stand ARR 2204 Fig 93 The central clutch shaft and the throw out collar The gearbox and the epicyclic reduction shifter rods i gear Fig 93 Gearbox casing mounted on rotary ARR 2204 stand Remove the two screws fastening the clutch throw out coliar support to the gearbox and remove it together with the engine clutch shaft and the flexible coupling Remove ihe gearbox cover with the shift lever remove the shifter forks after pulling the fastening pins beginning from the central rod 2 Fig 95 slide out ihe reduction gear control sleeve with shifter forks and rods lake away the 3 springs Section C C fig 100 and the detent balis Fig 94 Removal of gearbox casing from tractor Fig 95 Upper view of gearbox control gears and shifter Fig 96 Disassembly of primary shatt forks 1 Shifter forks for tst 4th gears and reverse 2 Epicyclic reduction gear control fork 3 Shift fork controlliag 2nd and 3th 3rd and 6th gears Arrows show the wooden wedge and the punch Primary shaft Note When also ihe secondary shaft is to be disassembled engage two gears in order to unscrew the front end fastening nut Take away the primary shaft front cover and remove the shaft by hammering on rear end Prevent the rear bearing from c
79. fuse failure search for the cause of fuse burning before replacing it The reasen may be found among the following the cutout relay contacts do not open as the engine sicps shert circuit reversed generator polarity 102 Sistas dut ad AM i Finally if the trouble is not due to one of the causes described at paragraphs a b and c look for it in the battery control box or generator To find out whether the trouble is due to the battery replace the existing one with a new one discharged so that if the cutput still goes to the maximum evidently the fault is in the battery If not look for it either in the contro box or generator by shorting momentarily the terminal 67 with the 51 and increasing the generator Speed Should the output previously absent or very low either reach a set value or increase the trouble is due to one of the following low current or voltage regulator setting current or voltage regulator contacts oxidized undue resistance interruption of the generator field winding or inside the unit Otherwise look for trouble in the generator REPAIR INSTRUCTIONS As a rule it is preferable to replace the contro box rather than repairing or adjusting it therefore only exceptional cases may justify handling it The repairs which can be done provided that it has been found for sure that it is the cause of trouble are replacing the cover the additional resistance
80. gear using universal puller 16 MB x 1 5 mm screw 2 required Check the oil seal of the differential axles and of the driving wheel shaft to prevent oil leakage on brake bands and from the driving wheel Check bearings for free running and tooth backlash see specifications an page 13 When reassembling avoid damaging the seal located in ihe differential bevel gear support BRAKES The pedal and hand actuated band brakes act on the pulley keyed on the differential axles The tractor when used on roads requires sudden and quick braking and therefore the pedals can be connected by a lock which ensures simultaneous braking action pedal free travel which should be equal for both This fact must be born in mind when setting the Fig 118 Brake assembly pedal and hand controls a Clutch control pedat assembly b Brake pedal assembly A Clevis lock nuts B Caps R Brake band centering screws S Inner arm T Outer arm V Inner arm fastening screw Z Brake band pivot pins There ave d Segnedi d ld Amay Ota Aiea one segment ER en B0 sp 4 6 EA sgins 4 fag Id fer Pudor a Brake overhaul To be performed as follows Removal from tractor inspection Assembling Brake adjustment 72 To remove brake bands drain transmission casing oil and remove from the tractor the final drives according to page 70 instructions remove the differential casing
81. generator runs at 2000 R P M b Characteristic obtained as generator runs at 2000 R P M for regulation group up to No 088917 for regulation group from No 088918 up Fig 142 Output characteristic on battery with group at 50 39 C 122 37 49 F 2 Avoid connecting group terminal 67 to generator terminal 51 even momentarily because heavy spar kling and group contact oxidation would follow and contact welding wouid also eventually follow It is thus indispensable to connect terminals having the same number as even if wrong connections are eventually corrected and the group functions regularly its usefulness would be nonetheless shortened Shocks to regulator unit should be avoided especially to its lower part containing the adjustment resi stance Fig 146 During the bench testing the group shall be mounted with its terminals placed down wards and an insulating sheet shall be interposed between the fastening support and the base Connection between group terminal 31 and tractor grounding shall be well secured otherwise the regulation effect would fail as both the current and the shunt coils are lacking This case allows the generator to increase its voltage as speed increases and windings are burned and voltage regulator and cut out contacts are damaged owing to excess of current excitation of the generator Regulator group bench testing To avoid miscalculations the regulator group performance data must be measured by in
82. he light S goes out at the specified setting The contact points entire closing stroke should occur at vollage variation lower than 0 2 V 2 Reverse current af a temperature of 25 10 C 77 4 50 F This test must immediately follow the preceding one in order to take advantage of the thermal stability achieved by the unit With switch T closed bring the voltage to 27 V by acting on the potentiometer P the cut out relay contact points are closed and light S off viose switch T3 increase the reverse current through the rheostat R and check that the light S goes on when the contact poinis open The opening may result io be unstable evidenced only by a ringing noise check the ammeter reading of the reverse current which starts the contacts opening 6 to 14 A Should the reading be uncertain or should the light go on the tolerance limit bring the reverse current back to minimum and increase it again working on the rheosiat R as instructed before open switches T and T and bring the sliders of the potent ometer P and rheostat R back io minimum Provide the conditions suilable to maintain the unit at a temperature of 50 4 39 C 122 379 F Affer wiring the unit according to the diagram of Fig 161 wind he adjusting spring of the current regulator by shaping the adjusting tongue 5 Fig 152 close switch start the generator and stabilize the temperature of the unit for 30 minutes at z 30 V by varying the ge
83. henever worn or damaged The epicyclical reduction gear thrust rings should be checked and if presenting signs of wear should be replaced At gearbox major overhaul remove the control fever sector plate located under the cover Fig 98 in order to check its components efficiency especially the ratchet 3 and the control lever dowels 1 which are subject to wear Fig 98 Gear shift lever Fig 99 Assembling of epicyclic reduction gear on gearbox secondary shaft 4 Control lever dowels 2 Sector plate fastening screws 8 Primary shaft rear bearing 14 Shim R Reverse gear 3 Gear selector pivot ratchet shaft V Shim pin j 60 e t T E a meterse Gearbox and epicyclic reduction gear reassembly To reassemble gearbox components proceed as follows Paris to be assembled Operations and cautions Secondary shaft Assemble on the shaft the rear ball bearing after heating it in an oil bath io a femperature of 80 C approx install in the gearbox the front bearing after sliding in the shaft from the box rear end and mount on it the gears according to Fig 97 Note The shaft nut tightening should be made after the installation of the primary shaft as it could be facilitated by meshing two gears at the same time Reverse if ihe bush has been replaced afier reassembly it must be reamed using reamer U 0321 up fo the dimension of page 63 Fasten the reverse shafi R as shown in Fig 99
84. ip 6 Regulation resistance 7 Additional resistance in series with the shunted winding of the voltage regulator 8 Base 8 Body 10 Damping resistance 11 Additional resistance in series across the shunted windings of the current regulator and cut out relay 12 13 Piates ciamping the leads of the windings to the additional 7 and regulation 6 resistances 14 Resistance terminals insulators The contacts points of the elements are fixed to the armatures 2 and to a support applied to the elements Point resetting is carried out by using a special tool on the tongues which carry the fixed contact points The cut out relay is similar to the other two elements and is also equipped with a hinge 1 made of one steel and one bi metallic feaves The armatures of the three units are equipped with adjusting springs 3 Adjusting is done by loading the tongues 8 of the springs The three units are fastened to the base by the threaded ends on their cores and sealed by a cover with a rubber gasket The base is provided with three terminals the num bers of wich are marked on the cover connected to the cables as follows 51 connected to the generator positive terminal 67 connected to the generator field coils 30 connected to the electric system The following resistances are riveted under the base Fig 159 the additional resistance tor the shunt winding of the voltage regulator 7 and additional resistan
85. ip it out refer to fig 126 After mounting ihe hubs check bearings which should rolate freely without any noticeable end play check surfaces and plays of king pins and of the axle pivot pin with their bushes check the bronze thrust tings thicknesses and replace them if in excess of wear limits see table on page 79 Fig 124 Removal of front axle and radiator from enaine Fig 125 Front axle mounted on rotary stand for over hauling T ae ch i H i i Assembling 78 Sect A A Fig 126 Front axle section Check ihe wheel hub cover rubber seals which must ensure protection against slush and moisture infil tration from outside into the bearing set near to the wheel a surface gauge and rotate the wheel to check the disc and rim for deformation this check concerns both steering wheels Check the camber of the steering wheels by laying a square in the vertical plane along the wheel axis and checking if for any iwo opposite poinis on ihe rim the difference between measured distances is constant check front tires for wear and replace them if their central steering ribs are too worn Assemble axle according to Fig 126 no difficulty should be experienced Note The lower bronze thrust bearing of the steering knuckle shall be installed with its lubrication passages facing the steel upper thrust bearing End the assembly by greasing ihe hinge pivot the steering
86. ire be interrupted the cut out and current regulator shunt windings have no current flowing through them as the circuit is not closed across the generator casing therefore the cut out contacts remain open which is signaled on the dashboard by the battery charge warning lamp which remains lighted Resistance trouble has no effect on the current regulator The resistance value is 73 to 77 ohms at 20 C 68 F Replacing one resistance calls for replacement of the other one too To replace them proceed as for resistances 6 and 10 Control box setting The setting of the control box on the test bench should be performed without the cover placing the box vertically wi h the terminals facing downwards Cautions If the control box has remained for a certain length of time at ambient temperature below 15 C 59 F or above 85 C 95 F place it for about one hour ata temperature of 25 10 C 779 500 F Wire the control box according to the diagram of Fig 160 and place the instruments as follows potentiometer P ai minimum voltmeter at zero switch T open rheostat R all on max resistance switch T open 7 Contact points closing voltage at a temperatura of 259 10 C 779 50e FJ Close switch T Stabilize the temperature of the unit equipped with its own cover by feeding it for about 15 to 18 minutes al a voltage of gt 30V through potentiometer P Cut out relay setting 108
87. light number plate and taillights two pole socket 100 mm dia floodlight with built in switch passing lights EH position 4 51 562 30 1 58 Starting switch battery charge warning light front parking lights dashboard light number plate and tailights two pole socket 100 mm dia floodlight with built in switch driving lights The key can be removed when at position 0 only Starter switch The starting switch operation is dependent upon the position of the combination lighting and starting switch Each position of the lever on the switch corresponds to a circuit and precisely position 0 13 54 All equipment off position 1 15 54 19 Glow plugs positlon 2 15 54 18 50a Glow plugs starting The lever returns automatically to position 0 from levers 1 and 2 Fuses The equipment belonging to the electrical system is protected by four 8 A fuses contained in a box placed near the dashboard and by two other fuses L H side front parking light R H side tailight 100 mm dia tloodlight with built in switch Fuse 54 4 protects Fuse 30 2 protects Driving lights Fuse 30 1 protects Passing lights Fuse 54 2 protects R H side front parking light dashboard light L H tailight and number plate light two pole socket 16 A protects the control box Other f 1 SUBE ases i 8A protects the electric horn optional The generator with
88. lutch ww 22 2 2 LLL 53 Flexible coupling 2 us 57 Specifications 1212511177 57 140 Page Gearbox and epicyclic reduction gear 58 Specifications 2 0 63 Differential and lock i 64 Specifications 0 002 69 Final drives ep LLL uL 70 Brakes isi c o Shee eo deal 71 Specifications Mus uds us 73 Steering and front axle TUR Wed 3 Steering box and linkage 73 Specifications 11 76 Front axle 2 000 77 Specifications 22117 79 Electrical system gos 60 Wiring diagram 80 Description 2 00007 LH Generator Type R 115 140 24 1600 Var 2 ag Specifications 0 a oF Generator Type DC 1 TSAMIT IS C 88 Specifications E e SL aA AE Neu ud 89 Control Box Mod Al3 140 24 2 Ln 90 Specifications 1L 96 Control Box Mod GP HF 2542 96 Specifications lu 107 Batteries wo eraa 108 Starting motor ww 110 Glow plugs 22 Lo ls 115 Attachments 2 laag aaa aaa 116 Power Take off 116 Bele pulley Pal sess goes ae oo 117 Specifications 118 Hydraulic BE Lo c sou vs 719 PUMP susp ERWIN a uo s 119 Operation veste Vel lul a 120 Control Cock a aa aaa 128 Specifications 00 7 130 Tool Hst i 2 131 Specifications 0 LL 133 Modifications aaa 137 i H i
89. mary shaft front bearing 4 1st speed and 4th speed gear 5 2nd and 5th 3rd and 6th speed gears 6 Primary shaft rear bearing 7 Reverse gear mounted on its shaft 8 Secondary shaft bearing retainer ting 9 Secondary shaft front bearing 10 1st and 4th speed driven gear 11 3rd and th speed and reverse driven gear 12 2nd and 5th speed driven gear 13 Secondary shaft rear bearing 44 Thrust ring 15 Epicyclic reduc tion fixed gear 16 Thrust outer plate 17 Epicyclic reduction driven gears 18 Shim rings 19 Reduction gear engagement sleeve 20 Driven gear shims 21 Stop ring for pivots 22 Driven gear axle rollers Note Starting from chassis No 427935 helical ieeth have been super seded by straight teeth The reverse shaft should be smooth and without scoring if the permissible clearance between the bush fitted on the gear and its shaft is in excess of the wear limits replace both bush and shaft The ball bearings should be perfectly smooth in operation without clatter The epicyclical reduction driven gears roller bearings and those for the bevel pinion shaft should have an assembly clearance not exceeding the value listed at page 63 and the surfaces mating such components should not be damaged in any way The gear control forks should be checked for deformation and hardening characteristics of the working surfaces They should slide freely with shifter rods in the box guide holes Replace gaskets w
90. mind that dependable results are dependent upon the observance of the rules and procedure which will be given below AEN Caution The test must absolutely be performed at the temperature specified for each contro and after at least 30 minute operation i e when the temperature condition specified has been reached This requires a special oven suitable for the thermal stabilization of the contro boxes Tests performed otherwise will not give dependable results Cut out relay check a Contact closing voltage at 2504 109 C 770 50 F ambient temperature In surroundings with the temperature specified above connect the con rol box according to the wiring diagram of Fig 154 and run it idle at 30 V for 15 3 lt to 18 minutes 51 67 30 This preliminary operation allows the unit lo reach H WU the thermal level allowing the cut out shunt winding and the bimetallic spring blade to reach thermal i 87 stability after an initial period during which the voltage oscillates considerably 4 z om es S Immediately after obtaining thermal stability star 8 Q ting from an inactive generator gradually increase Ns the speed to check the voltmeter for the value of the cut out contact closing voltage which should a read 25 1 to 25 9 V when the tight goes on x oh b Reverse current in ambient temperature of 25 f09 C 77 590 F Fig 154 Electrical diagram at the arrangement for testing
91. ms from underneath the screw head see paragraph b of lift adjustment on page 125 Check the parts involved and re place the damaged ones 9 Usually accompanied by a considerabl e incremenf of the time Tequired to raise the load Replace it o losd ig AP le ZE ga cocer TOOL LisT 7 pomme eae Tooi No i Description Page No Fig No i A 051322 Hammer brase so LLL LLL LL LLL ea 66 A 5717 Swiwel stand pump overhaul 222 550221777 39 A tiitt Grinder engine valves 2252111221007 18 A 12131 Hand pump s sa p eih 1L 38 A 18707 Adaptor 35 A 19177 Dial gauge 2 de hae de 4D A 117019 Wrench injection pump timin 49 80 TA 117082 Wrench engine timing gt 49 A 117083 Pilot rod 2 d E x 56 90 51 A 117068 BUSHING uou Siga wu nt 2 du A 47 A 127050 Gauge control box setting Uo 104 157 A 127051 Gauge controi box SOHN is is e o as SIT 104 A 137003 Adaptor gearbox primary shaft 020102717 62 102 A 137010 Gauge bevel pinion uu tog NL E 68 112 158 A 187014 Lock f nal drive Ls ORE ED 70 A 197008 A E j Driver and protection 2 22 Tilt rite 125 85 A 197016 MERE CN hance toe wee d 127 188 A 197032 4 8 Valve holder hydraulic i 22 550115117107 j 124 184 A 197035 EMG o ieri esos E EAR tt DA we LU 127 189 A 217028 Male spring compressor oJ II IIIN 13 21 A 217039 A B C D E F G Cutters and spindle set for valve seat grinding a 12 A 217072 A
92. nd 150 The passage of current across the shunted windings of the control box units causes a temperature rise which produces an increment of the ohm c resistance and consequently the quantity of current golng through them is reduced As for the armatures the current reduction results in less magnetic pull therefore a voltage higher than the set values would be needed in summertime to open the voltage regulator contacts and close the cut out contacts To compensate the reduction of the magnetic pull on the armatures the bimetallic blade which makes up the hinges Is so disposed as to gradually reduce the tension in the spring as the temperature rises In the case of the voltage regulator the action of the bi metallic blade is more than sufficient to maintain the set voliage against the variations of ambient temperature thermal overcompensation therefore the setting is stightly lower In the summer and slightly higher in the winter This setting value of the voltage which varies slightly according to the temperature favours long life of the batteries the voltage of which when current passes through decreases as the electrolyte temperature increases and on its part elec trolyte also is sensitive to the surrounding temperature Therefore should the voltage setting of the voltage regulator not follow the requirements of the battery temperature conditions the following trouble would develop when room temperature Is high the voltage woul
93. nd 193 is installed on the power lift unit in place of the control valve block cover From the latter it is possible to recover the gasket and the complete pressure valve which can be installed in the new unit The operational diagrams for single and double acting cylinders are Shown on Fig 194 Hydraulic diagrams showing the operation of one double acting cylinder C Hydraulic diagrams showing the Operation of single acting Cylinder Fig 194 Diagram showing the operation of ihe control cock connected to single and double acting cylinders 4 Pressure relief valve 5 Control cock pin 6 Double acting cylinder line fitting 7 Plug 18 MB x 1 5 to be used when operating single acting cylinders A Stop position B Lifting position C Lowering position 29 HYDRAULIC LiFT ASSEMBLY DATA i i Wear Description i S CR Assembly clearances mm in limits ES mm in mE i Inside diameter of cylinder sleeve 85 035 to 85071 3 8470 to 3 3493 sleeve and piston 0 0014 to 0 0041 10 010 Diameter of piston 84 965 to 85 000 Inside diameter of cylinder 0 085 to 0 108 ops i 3 3481 to 3 3465 i i Inside diameter of bushings cn arm 55 100 to 55 170 contro shaft right end 2 1693 to 2 1721 i 47 100 to 47 170 Arm shaft and bushings i left end 1 8543 to 1 8571 tight end 0 100 fo 0 200 0 0039 te 0 0078 gi let end 0 100 to 0 195 0 01
94. ne 0 3 0 6 mm 0 01 18 0 0236 Diameter between pale shoes midlde line NES 70 6 70 8 mm 2 776 2 787 Al gama ex ae uae dra sepe ee DE a UE 9 8 0 457 mm 0 0113 0 0126 Tightening torque of drive pulley nut Ls 7 kam 50 63 ft Ib 87 GENERATOR TYPE DC 115 24 7 3 C PULLEY Pho TIRTAS o0 82mm Specifications The generator type DC 115 24 7 3 C illustrated in Fig 138 has been mounted beginning from engine No 005045 its specifications are Voltage o ee aes x 24 V Maximum continuous current amp re limited 2 sooo e 7A Maximum current ean a a E a m oho oho ro mom roe hh m e son 85 A Maximum continuous power EDI 196 W Maximum DoWet amp oo cep as Rm dor REX RUE Y EY d o Rom wo 238 W Cut in speed 24 V 209 C 68 F er rr e t n n n n 1550 to 1650 R P M Speed of maximum continuous current 7A 20 C 68 BE le eM nee 23 3 125 to 1875 R P M Speed of maximum current 8 5 A at 20 C BBE xov eX EU Ge PM E E cals 1770 to 1930 R P M Maximum continuous speed o e e o e hr e e n n n 5800 R P M Rotation from drive side 6 4 e rte t n clockwise Excitatlon o m eee dd uU UR uu ree diu EMSS ese uy ep shunt Regulator group e Pkw P3 RUE he on awe Ra type ahaa l GP 1 24 7 Main features of this generator compared with the preceding one are completely enclosed more power reaction type brushes Reaction brushes are advantageous as vibrations against the brush hol
95. nerator allows a quicker battery recharge especially if its charge level is low due to repeated and cold startings The limiting current is a function of the Surrounding temperature and therefore during the summer the limiting current will be less than during the Winter and the generator temperatures during the various seasons are more uniform Checking the generator troubles and re 1 i i medies EAs i rab r IT UN Consult diagrams of Figs 129 131 132 for the N i generator checks and for the coil check the i Figs 133 134 135 Tests to be carried out as for generator type 8 R 115 140 24 1800 Var 2 For specifications see table on page 89 5 Plotting the output curve Fig 137 requires the previous inspection of the brushes that should be completely seated upon the commutator which takes place after ten hours of operation with a i current output of 7 A at 2900 R P M QU Ld z 1000 1500 2000 2800 See page 85 for the generator trouble shooting Fig 137 Output curve of generator type DC 115 24 7 3 C and repairs Beginning of battery charging at 24 V 1550 1650 RPM GENERATOR FIAT DC 115 24 7 3 C SPECIFICATIONS f M M Items Values i n on z TE Speed 1170 1330 rpm Operational test as motor Voltage 24 V l Cwrent eee ll nl
96. nerator speed open the switch and bring the generator speed up io 3500 R P M adjust the load of the adjusting spring of the vollage regulator by bending the tongue and the rheostat R so to obtain a regulating voltage and a medium charge current of 28 7 to 29 7 V and 5 A respectively check stability and accuracy of the regulation voltage by stopping the generator and running it again up fo the speed of 3500 R P M This fest must immediately follow ihe preceding one holding ihe test temperature at 509 39 C 1229 37 F and using the same instruments and the same wiring diagram Fig 161 close the switch start the generator adjust its speed and rheostai R fo obtain a voltage and a current of 28 V and amp 8 to 7 4 A respectively RR riis asec jo after 30 minutes of operation at the above conditions stop the generator and open the switch Bring the generator back to a speed of 3500 R P M adjust ihe load of ihe adjusting spring by acting on the tongue 5 Fig 182 and the rheostat R io obtain a regulating current and voltage of 6 6 io 7 4 A and 28 V check the stability and the accuracy of the regulating current by stopping the generator and running it again up to a speed of 3500 RP M Performance check and sealing of the unit Once set close the hot control unit with cover and gasket before it undergoes the bench test as from instructions of page 100 and following Then put the paint
97. ns so that the brake pedal travel is about 50 mm 1 969 Before adjustment the brake control lever should be set all ihe way down with respect to the sector plate SPECIFICATIONS OF BRAKES AND FINAL DRIVES p Data Wear limits mm in mm in Final drive pinion and bulb gear tooth backlash 0 15 to 0 25 05 0 0059 te 0 0088 0 0197 Clearance between driven gear driven shaft splines and gear hub 0 050 to 0 048 0 20 0 0020 to 0 0019 0 0079 Brake pulley diameter 2 2 4 210 i 8 2877 Brake band shoes thickness 2 6 i 4 0 2362 0 1575 Clearance between bushes and brake pins io oana 0 040 to 0 144 04 0 0018 to 0 0057 0 0157 E E r ie Bia hie ara POs 8l sq ths se Page n STEERING AND FRONT AXLE STEERING BOX AND LINKAGE Removal and disassembly The steering box removal and disassembly should be made as follows Parts fo be removed Operations and cautions The batteries The dashboard Remove jt with ils frame from the battery box and ihe gearbox detach the rear fighting cable from central connec tion Steering arm from drag link The steering box l Slacken ihe 4 screws fastening ihe batlety box to E gearbox remove screws fastening the steering box to gearbox remove the steering box with the dashboard lift the battery box first Clamp the steering box in a vise and remove the fallowing components Steering a
98. ntrol operation at every position of lever A corresponds a different height of the lift arms and consequently of the imple ment In the draft control operation most of the excursion in the quadrant is used to determine the draft at the implement during work Whenever lever A is moved the control valve Spool rotates and according to its sense of rotation lets oil pass in different conditions through the valves of the hydraulic circuit which control the raising or the lowering of the arms In the position control operation the height of the arms can be controlled through lever A only while in draft control also intervenes the reacting force which the implement passes on to the spring M Fig 175 The deformation of the latter consents the rotation of the control valve spool the strain of the spring being transformed by a lever mechanism and consequently a movement of the arms which brings the resistance encountered by the implement in the ground back within the limits established by the position of the lever A in its sector In position control operation the selector lever B acting on the relative position of levers and rockers of the linkage cuts off the control valve spool from the effects of the strain set by the implement on spring M Fig 76 illustrates the hydraulic diagram of the system For further details on the power lift operation see the Technical Information Bulletin Form No 324 192 120 an oO FANNER AAA
99. o 30 minutes the regulated current to a value which the generator can tolerate therefore the tem 88 porary overload of the generator not only does not damage the windings but is good for the battery particularly when the charge is low which may happen after difficult or repeated cold starting or after the kind of work which requires repeated startings for short hauls the regulated current is dependent upon the temperature of the surroundings and will be higher er lower depending upon a low Winter or high Summer temperature which for the generator means more uniformity of tempe rature through the seasons The curve of a hot control box is plotted in Fig 153 and as one can notice it starts with an almost horizontal line which shows that the current is maintained constant up to a certain voltage then drops quickly The junction area between the two strips shows the operating limit between the voltage and cur rent regulators QU CUT RELAY Fig 152 Front view of the control box 1 Current regulator armature hinge 4 Fixed contact support lip 5 Adjusting spring support lip 51 87 30 Terminals This regulation system takes full advantage of the generator output and maintains the battery at a good level of charging even after difficult or often repeated starts Should the battery be discharged it will be recharged with the maximum output current up to a high charge 28 V and when the latter is
100. o the same we So EISES Fig 170 Belt pulley unit section L Bevel gear adjustment shim P Bevel pinion adjustment shim SPECIFICATIONS ASSEMBLY CLEARANCES AND PERMISSIBLE WEAR OF POWER TAKE OFF AND BELT PULLEY COMPONENTS Data Wear limits Assembly clearances T 1 mm in mm in Take off gear backlash n 0 10 to 0 20 j 0 0639 to 0 0078 9 4 i 0 0157 i i Between driving gear Splines and power take 1 i off control shaft 0 0 010 to 0 105 9 0004 to 0 0041 0 25 0 0098 i i i Between gear splines and power take off driven i l METIR ELERE eee Gy e aaao UBRO BE 0 0009 to 0 0005 i x Belt pulley pinion backlash 2 615 d 0 0059 i 04 0 0457 Between driven gear splines and pulley shaft 0 024 to 0 072 0 0009 to 0 0028 T E 10 0630 0 0709 0 0787 i Belt pulley gear adjustment shims 0 i 1 8 1 8 2 2 2 2 4 0 0886 0 0965 118 HYDRAULIC LIFT Fig 171 Hydraulic pump mounted on tractor Fig 172 Hydraulic lift mounted on tractor A Lift control lever B Selection laver position coatrol requires the lever to be shifted down M Spring for reaction strut Hereafter are the main components of the lift mounted on 411 R tractors gear hydraulic pump driven by engine timing gears Fig 171 a lift with integral oil tank composed of a ram simple effect acting through a ball headed link on a lever keye
101. old on battery 1 7 OO Grou i P Regulation voltage Closing voltage Inversion current Battery at half load on Limitation current i battery H V A i Ah y E A amp ec Up to No 088917 25 1 25 9 not more than 5 60 No 2 batteries 28 7 29 7 5 5 5 in series with 4 A from No 088918 up 25 1 25 9 5 to 10 with 0 No 2 batteries 28 7 29 7 4 75 5 25 wiring of Fig 144 in series with 4 A i sistance of group Fig 148 at 20 C 68 F is 138 142 ohm 95 4609883 CONTROL BOX MOD GP 1 247 Part No 1955889 Description The Control Box Mod GP 1 24 7 is composed by three units cut out relay current regulator and voltage regulator Both the voltage and the current regulators Fig 149 consist of a U shaped body with a bend on the end of one arm and a tongue 5 on the other An armature 2 supported by a tension spring 1 is fastened to the body 9 The spring is made of two blades lying flat on each other one of steel and the other bi metallic Fig 148 Sectional view of the voltage regulator Fig 150 Sectional view of the cut out relay c Air gap between core extension and armature io be d Air gap 0 64 to 0 765 mm 0 025 to 0 030 in measured at the position indicated by the axis 0 0 0 99 to 1 11 mm or 0 039 to 9 044 in 1 Hinge spring steel and bi metallic 2 Armature 3 Adjusting spring 4 Fixed contact supporting lip 5 Adjusting Spring supporting l
102. oming off together with the shaft by placing a wooden wedge as shown in Fig 96 If necessary pull out the bearing also using punch A 960703 Reverse gear and its shaft Remove ihe stop and slide out the shaft together with the gear Should the shaft remova offer some difficulty apply a screw to the threaded hole in the axle Remove bush from gear using the punch A 928251 Secondary shaft Remove the epicyclic reduction unit and the gearbox wall inner thrust disc slide out the secondary shaft with a bronze punch hammering it on its front end Checking the stripped out components of the gearbox and epicyclic reduction gear Check gearbox and epicyclic reduction gear components against specifications of page 63 Neither gear teeth nor chamfered surfaces should be damaged Check if the teeth of mating gears are working on the whole face length and if the surfaces are smooth and free from signs of scoring or hammering The sliding gear hub internal splines should be free from marks of wear or seizing and all splines should have their corners without signs of hammering The splined primary shaft should be absolutely free from pitting or scoring especially on gear sliding sur faces Slide the gears on the shaft and check for clearance between the gear guide flanks and the cor responding shaft spline flanks 59 Fig 97 Gearbox and epicyclic reduction gear parts 1 Ciutch gearbox coupling 2 Cover gasket 3 Pri
103. only can ensure a regular and long lasting operation of both commutator and generator b Field winding Check field coils by circulating test bench current though them Fig 133 and measuring the voltage and the current with the bench instruments then calculating the coils resistance If connections alone are interrupted repair them carefully but if the winding is damaged replace the as sembly with a new FIAT spare We do not suggest making field coils as a Special procedure itr required Pole shoe screws should then be fully tightened to set the air gap at its previous value Reboring of pole shoes must never be resorted to if the air gap see table on page 87 is not obtained we advise warning up somewhat the coils which are already shaped to facilitate their installation c Armature Commutator If commutator bar surface contacting the brushes is worn or out of round turn down the commutator Be careful when fixing the armature in a lathe and centering it as the installation of armature assembly between centers is not possible Commutator centering should be most accurate as commutator out of round measured on brush ways should not exceed 0 01 mm 0 0004 After commutator turning undercut the mica between bars using a saw blade to a depth of 1 mm 0 0394 Armature winding f damage is in the armature winding replace the whole assembly It is not advisable to attempt making a new coil as a special procedure would
104. ontrolled by the power take off lever shifted into MOTORE engine In both cases If necessary interchange Major overhaul Dismantling Drain lubrication oil remove the pulley from drive shaft end and take away the Opposite end cover remove the snap ring from the driving shaft Support and hammering on a bronze punch from the inside remove the shaft and all its parts The roller bearing outer race if necessary is removed from its seat after taking away the snap ring from the pulley driven shaft remove the nut and its split pin and using a bronze punch push out the driven shaft The roller bearing outer race and ihe ball bearing remain in their seats and may be removed affer laking away the snap rings Fig 162 Belt pulley unit 117 Checking all components Check bevel gears and shafl Splines according to dala of page 118 mh check bearings for correct functioning and shaft seal for oil leaks Reassembling and adjusting the pulley assembly Refer to Fig 170 and reverse the Sequence followed y for dismantling Bevel pinion and wheel adjustment made by varying ihe shim ring P of driving pinion and shim ring of bevel crown gear The suggested clearance for bevel pinion and wheel is of 0 15 mm 0 0059 and should be obtained by varying the L and P shim ring thicknesses Service with SAE 140 oil the beit pulley assembly until level reaches the plug located on the cover opposite t
105. or and sfowly run it up to the Speed rate of 2000 R P M adjust rheostat so that generator delivers a current of 4 A half load current Check that at such current value the voltage is about 28 7 to 29 7 V Limitation current on batteries Connect group according to wiring of Fig 145 and check the limitation current on batteries immediately after the foregoing test using the same instruments proceed as follows rheostat should be set at its maximum resistance value resistance shall then be reduced until the current limitation value of 5 to 5 5 A has been reached for groups up to No 088917 and of 4 75 to 5 28 A for groups from No 088918 up corresponding voltage 28 V gt said currents should not decrease when resistance is reduced and on the contrary voltage shouid go down nearly to 24 V for groups up to No 088917 93 Regulator group repairs In most cases when the unit does not perform correc to repair and calibrate it For ihose groups with numbers from 088918 Up the resistance being decreased the current shail increase up lo 6 A approximately and the voltage decrease down to 24 V tly it is advisable to substitute it instead of attem pting Exceptionally if in need of repair follow the bench checks already described successively according to the data obtained replace the resistance Fig 146 and faulty elements Always replace complete units Components elements as well
106. ove ground i maximum 880 mm 245 470 mm 18 9 DIMENSIONS AND WEIGHTS i Mihselbagers eos erc ete eher et T et eg j 1825 mm 124 7 1819 mm 712 1280 1380 1480 1260 1360 1460 1580 1680 1780 1560 1660 1760 4880 1880 mm 1960 1980 mm Fi FontetrBs do abe M e e cerea Macca tanh AE oh o 8034 54 583 49 53 5 873 j 623 667 704 615 653 68 TA 18 BY TH C See new drawbar specifications on page 139 for tractors with chassis No 429451 up 134 3 Taco Wee enu bid Sab Sy SERS PE LER T A 615 000 615 103 i ben 1200 1300 1400 i 1500 1600 1700 1800 1960 mm the same as Reartread past V NU Led wie Such tu IRR end IS 20 De511 551 ier type 615 100 sene o R A with drawbar ii era a anaa erd 2800 mm 114 2880 mm 113 Overall length of tractor without drawbar ee sss 2820 mm 111 2755 mm du i j with min tread 2 ee 1500 mm 58 1490 mm 583 Overall width i with max tread oaa 2200 mm 86 2190 mm 86y Ao as to the top of steering wheel 2 0 2 i 1418 mm 55 1335 mm 521 Max height tothetop of bonnet 0 isl 1370 mm 54 1300 mm 1 7 Ground clearance under front axle 2 ll 50480 mm 18 7 400 mm 15 7 Ground clearance under rear axle 0 0 2 2 ln i Operating weight of tractor ee ee 1420 kg 3130 Ib 1400 kg
107. pecifications of the hydraulic pump to check its performance ratio between engine and pump RPM s loss 1462 pump speed with engine at rated speed 23800 R P M 2 000 R P M sump rotation as viewed from driving shaft end 2 2 000 clockwise suction head ee ee 5 Bois y hy ae Mens cres 6 5 es 300 mm x 11 8110 deliveries oil at temperature at 0 kg sq cm psi 000 17 liters min 3 75 Imp gal of 60 C 1409 F at 150 kg sq cm 2133 5 psi 16 5 liters min 3 65 Imp gal pressure valve opening pressure marked C or E 149 155 kg sq cm 2082 2205 B S To secure a good performance of the lift hydraulic pump use exclusively SAE 20 hydraulic oil avoiding all mixtures A The customer shali be warned that periodical checks and cleaning of the hydraulic lift oil filter is absolutely necessary After the first 20 hours from any oll change clean accurately to remove dirt from the filter Fig 178 Hydraulic lift pump components 1 Shaft bushes 2 Forward cover 3 Delivery port HYDRAULIC POWER LIFT OPERATION The power lift consents performing two different operations position control and draft control To choose either one just move lever B Fig 172 downwards in the former case and upwards in the latter The lever can be actuated only when the lift arms are raised The lift arm raising or lowering control is performed by lever A In the position co
108. r out of round which should not exceed 0 02 mm 0 00078 if necessary and if the commutator bars have not been thrown out of round by centrifugal force turn them down then undercut the mica of 1 mm 0 089 using a saw blade Check armature conditions with the same device used for the generator and if grounded renew it Fig 166 Parts of starting motor clutch 1 Clutch rollers way 2 Clutch rollers 3 Push rod for clutch rollers 4 Ciutch hub Reassembly instructions To reassemble the starting motor reverse the sequence used for dismantling Before assembling clean armature and brackets with a strong air jet and clean the commutator using a dry cloth 114 i i i i i i j i i i 1 1 i 1 4 1 1 i j Refill the free wheel and the starting pinion fork guides with high melting point grease when assembled before the test bench checks see that end clearance C Fig 165 Is 0 85 to 0 75 mm 0 0138 to 0 0295 STARTING MOTOR PERFORMANCE DATA i Specifications Values ES CUTTER a eh erue eot eq re ir i WUB 4 Fe esse ete vr vos 185 to 2 gm 13 3 to 15 8 fib Operational test under load i speeda i 1510 to 1610 r p m voltage j iV gurtent 68a dl arate ey ook etree E o 600 A Checking motor torque when stopped voltage esu Due m ey Ab Aaah VIN i 12 7 t0 13 V VXOIQUE ic ae chug ERR EO 82 lo 4 78 kgm 33 4 to 34 3 ft Ib CUED ioe ang ga
109. rations Operational test under load Wire up according to Fig 164 Use a tesi bench fitted with a ting gear having a ralio between pinion and gear of about 1 to 1 0 make Some starlings of shori duration and check by braking the motor until a Current of 285 A js reached that its torque is about 1 85 to 215 kom 42 4 to 15 7 fiib at 1510 to 1610 R P M the voltage being 18 y Checking motor torque when stopped Stop the test bench ting gear switch On and adjust voltage to motor terminals so that it will absorb a current of 620 A at 12 7 13 y The starting molor should then deliver a torque of 462 io 475 kgm 33 4 to 34 3 fidh Idling test of motor Clear away the t ng gear to preveni is meshing with the pinion Shut the starting switch and adjust the terminal voltage at 24 y Motor should ihen absorb a current not exceeding 30 A at 4000 io 5000 R P M Electromagnet run The mobile contact of electromagnet Should perform a run of 64 to 8 45 mm 0 252 to 0 333 the core being of 8 5 io 10 1 mm 0 334 to 0 397 Motor internal total resistance The test data of the moter when stopped allow calculating the motor total resistance by the ratio between the voltage applied and the Current At 40 C 104 F the resistance should be Of 0 0205 to 0 0218 Ohm Field coil resistance 1 The main field coil resistance in Series at 200 C 68 F should be of 0 0060 to 0 0070 Ohm 2 The Secondary field coil resist
110. rease up toa given limit at which it will drop to zero cut out contacts open Said limit represents the maximum reverse current value which should be 6 to 14 A M MM M M Note To repeat the test if necessary begin from a stopped generator to avoid incorrect readings due to residual magnetism in the magnetic material of the cut out Regulation voltage on half charged baitery ambient temperature of 509 3 C or 1220 37 49 F Connect the group according to the diagram of Fig 156 and operate it at 50 399 C temperature for about 30 minutes with 2 half charge current output corresponding to 8 A Immediately afterwards maintaining the box at an ambient temperature of 50 3 C stop the generator and run it again at a gradually increasing speed up io 3500 rpm adjust the rheostat so to set the ge nerator half charging with a current of 5A at 28 7 to 29 7Y Regulation current on battery this check must im mediataly follow the preceding one Connect the unit according to the diagram of Fig 156 and connect the rheosiat maximum resistance operate the unit at 50 3 C ambient temperature for 30 minutes at regulation current speed to this end decrease the resisiance of rheostat until the current remains about constant and the voltage drops and at the specified 28 V At the end check that the output current has become stable i e thermal stability has been reached stop
111. relevant levers the power take off driven gear and the reduction gear engagement sleeve Beve pinion and ring gear adjustment When checking or replacing the bevel pinion and gear the following adjustment sequence should be fol lowed a bevel pinion shaft bearing adjustment b differential case bearing adjustment c tooth bearing adjustment d tooth backlash adjustment The sequence of operations is as follows a Install the bevel pinion shaft and its bearing the power take off driving gear the spacer and the adjustment shims Ra Fig 100 To calculate the shim thickness subtract from 58 5 to 59 5 mm 87 Fig 112 Rear view of toot A 137010 for bevel pinion Fig 113 Right view of tool A 137010 for bevel pinion and gear adjustment and gear adjustment 2 802 to 2 842 the sum of the gear width and the spacer width Finally check the shaft tor free rotation and mount in place of the foregoing shims others having their total thickness minus 0 05 mm 0 002 which will set a 50 kg mm 110 Ib pre load on the pinion bearings Remove the bevel pinion and mount the bevel gear complete with differential pinions and supports tighten one of the pinions with its screw and check with a feeler gauge at the other support the overhaul thickness of the bevel roller bearing shim rings Divide it by two placing each of the two halves Re on the two supports and check if rotation is free but without end play For a
112. rm Use puller A 735008 Shatt and roller Remove the adjusting screw focknut and the roller Shaft side cover see Fig 123 78 Remove the steering wheel and the board remove ihe screws fastening the steering column to the steering box and remove the steering shaft and its bearings Note When dismantling the roller bearing ouler races from the steering box do not alter the shim pack S Fig 120 Worm gear shaft Fig 120 Steering box perspective view R Roller washers S Screw to roller tooth aligning shims T Taper roller bearing adjusting shims Gg and Gp Roller shaft seals Vr Adjusting screw Fig 121 Steering box mounted on tractor Inspection of stripped out components of steering box and steering unit Check mating surfaces of roller and worm gear for notches or traces of seizing Check alignment of roller and worm gear this signifying that the roller and worm screw reciprocal position is correct if otherwise the shims should be changed S Fig 120 Check for clearance between bushes and the roller shaft according to specifications of page 76 and replace bushes when limits are exceeded in order to maintain proper mesh between roller and worm gear Ream bushes after assembly using reamer U 611916 to achieve the correct diameter If roller shows end play due to wear of the two washers R Fig 122 replace the shaft also being the parts riveted together Check the taper
113. roller bearing for free play and the roller shaft oil seal Check steering arm and drag links for straightness if bent straighten them and make sure that their Strength is unimpaired Steering box assembly Paris to be assembled Operations and cautions The roller shaft bushes if bushes have been replaced after reassembly ream them using reamer U 611916 up to the diameter specified in page 76 74 The lower taper roller bearing outer races and shims S Fig 122 Fig 122 Roller tooth cross section R Roller washers S Shims centering screw to roller T Centering shims taper bearing adjusting shims The worm gear with the taper roller bearing ad justing shims T Fig 122 The roller shaft the cover and the Steering arm Adjustment of roller and worm gear bearing B To avoid altering the setting of roller and worm gear the shim pack thickness should be varied if the worm gear the roller or the steering box haya been replaced the shims pack should then be adjusted as follows a mount the worm gear assembly after smearing it with red lead compound and adjust clearance of iaper roller bearings b mount the roller shaft cover and the steering arm C adjust the roller and worm gear bearing accord ing to indicalions following Note Each variation of shims S calls for a new adjustment of bearings wilh shims Fi Fig 123 Longitudinal
114. rovided with a suitable flange Fig 90 b Adjust the clearance B Fig 90 of ihe power take off pressure plate clevis Check that clear ance be 1 5 ilo 2 mm 0 0591 to 0 0787 and if different unscrew ihe locknui and screw on or unscrew the sleeve The clearance adjustment may also be made when ihe clutch is mounted on the tractor through the gearbox side cover The free travel of the clutch pedal is 25 to 5 mm 0 9643 to 1 3780 Plate wear however decreases ihe free travel Unscrew the pedal tie rod clevis as much as necessary lo reestablish the previous value The centering of the assembly on the engine flywheel is facilitated by using fixture A 117063 Fig 91 that may also be used for the disengagement levers adjustment when fitted with the proper plate Fig 90 Fig 81 Mounting clutch on engine using tool A 117063 FLEXIBLE COUPLING BETWEEN CLUTCH SHAFT AND GEARBOX Noisy transmission Calls for the dismantling of the elastic coupling to check the rubber block efficiency if blocks have excessive wear replace them When reassembling ascertain the correct function ing by locating coupling and shaft splines correctly according the drawing of Fig 92 in addition tighten the fastening bolts of the flanges to a torque of 2 5 kgm 18 fiib Fig 92 Diagram of flexible coupling for clutch aearbox i shafts CLUTCH COMPONENTS SPECIFICATIONS ASSEMBLY CLEARANCES AND
115. s 7 11 Fig 158 the damping resistance 10 and the regulation resistance 8 The spares are furnished in special containers to avoid contacts with foreign material Most of the faults of the trouble particularly the more serious ones such as excessive consumption or welded cut out relay contacts oxidized or pitted voltage or current regular contacts coil shorts and wind Ing overheating are due to faults outside the unit and particularly to the same faults of generator com ponents fleld winding resistance altered wrong brushes faulty cables etc Therefore the repair man should not content himself by replacing the control box which has anyhow a high factor of safety in operation but rather check the generator and the whole charging system Cover replacement Should the replacement be due to bruises or warping we suggest to check the control box prior to replacement according to the testing procedure of page 100 and following When replacing the cover check the seal gasket and place spring washers under the screw heads of the base then tighten the screws until the two ends of the washers come in contact Finally apply a paint seal on the head of one screw Replacing the regulation and damping resistances 6 10 Fig 159 Here follow the causes and their respective consequences in case of wire interruption or shorts of the resistances 8 10 Fig 159 a control voltage low or very low 8 oxidized voltage
116. s and their gaskets When mounting the first cover slide it on fixture A 137003 which avoids the oil sea gasket being damaged by the primary shaft splines contact Fig 102 Fig 102 Mounting the primary shaft front cover using tool A 137003 introduce through the gearbox wall holes the three detent springs and mount the ball and the first gear shifter rod with iis spacer and fork introduce through the wall middle hole ihe iwo epicyclic reduction gear control rod check balls see diagram C C Fig 100 and complete the assembly by introducing the two balls from ihe relevant hole and mount the rod the spacer and fork actuating the second and the third gears Note The cuts of the pins fastening forks to rods should be oriented so that the strain expand the pins in their holes Fig 103 Mount ihe fever and the two dowels in the cover and add ihe cap and snap ring mouni to the cover lower section the sector plate and fasten it with the two screws 2 Fig 98 mount also the gear selector pivot 3 Before mounting the cover shift in neutral all gears Gearbox clutch control shaft Mount on gearbox cluich control shaft the flexible joint the support the bearing and its disengagement sleeve Before mounting all par s on the primary shaft be sure that the seal ring is installed Fig 91 NOTE Shift the gear shift lever backwards thus disengaging the reduction gear in order to facilita
117. s 294 V Rated output ee ee ee ee a e 3 KW i Excitation 5 vee eee Nc TI o aos a a S A e compound Direction of rotation pinion side 2 aaa aaa a aa clockwise The starting motor mounted on tractors of series 400 is a direct current 4 pole motor with Solenoid and free wheel engagement pinion drive Fig 163 Fig 163 Starting motor 1 Remove control switch terminal 2 Terminal tor motor field coil 3 Remote control switch 4 Pole piece fastening screw 5 Starting pinion 6 Belt for brush Protection 7 Through bolt nuts Test bench checks As voltage during tests should be approximately constant the starting motor shall be energized by large capacity batterles The specified voltages applied to the motor terminals shall determine the prescribed current drains through the setting of a rheostat No result would be reliable if such conditions were distegarded with the exception of the torque reading and only approximately To verify the motor performance check the electrical and mechanical specifications as follows b p50 AM Mim Fig 164 Electric diagram for bench test of starting motor M Starting motor V Voltmeter 30 V top reading A Ammeter 1000 A top reading B Batteries 12 V 100 Ah connected in series fully charged R Rheostat carbon plate type 1000 A top reading f Switch a Starting motor electrical diagram 110 AB iac a attt 3 E Checks Ope
118. s and the pole terminals 2 Separators for protection of battery lead plates from vibrations made of extremely thin porous rubber or of polivynil plastics 3 Self leveiing and splash proof plugs allowing electrolyte self leveiling and preventing its splash ing from the vent holes when tractor jolts in operation Sizes length 368 to 372 mm 14 4882 to 14 6456 widih 173 to 177 mm 6 8110 to 6 9685 height 197 to 200 mm 7 7559 to 7 8739 Battery makes Marelli 6 TF 9 Titano 6 CR 4 F Weight with electrolyte approx 24 kg 52 910 b Cleaning Keep batteries clean and dry particularly the upper Darts thus avoiding especially afler the recharge ihe corrosion of ihe element sealing compound smear ferminals wilh pure vaseline avoiding the use of lubricating grease as it reacts with sulphuric acid of ihe electrolyte vapour or liquid Electrolyte level checking and top up Electrolyte should completely cover the element plates and top up them of about 8 mm 0 1969 Distilled water only should be used for topping up then make sure the plugs A Fig 162 are fully tightened For longer battery life avoid any contact between water and metallic containers Battery charge check Unscrew the plug and introduce the hydrometer in each element the specific gravity represents the battery charge conditions as follows Electrolyte gravity Condition of ba
119. se spring i Gearbox selection release springs Spring free length 2 2 eee 36 5 mm 1 4370 ia Spring free length 2 1 21 2 mm 0 8346 in Spring length under check load 31 5 mm 1 2402in Spring length under check foad 16 5 mm 0 6498 in Check load 14 7 to 16 3 kg 32 4 to 35 9 1b i Check load ms a ioi we 18 4 to 20 4 kg 40 6 to 45 Ib i 63 DIFFERENTIAL AND LOCK The rear half of the tractor body is a case housing the differential assembly and its lock it is closed at the rear by a cover through which the power take off shaft projects the belt pulley unit may be attached thereto The case upper opening allows the fitting and removal of the power take off drive and driven gears Fig 104 Removal of engine and gearbox from rear transmission casing Disassembly Fig 105 Transmission casing rear cover removal To remove the differential case from tractor and to dismantle it proceed as follows Parts fo be removed The hydraulic lift Drain lubrication oil The gearbox from the differential case Fig 104 The final drives Fig 185 The seat The transmission case rear cover Fig 105 64 Operations and cautions Remove if installed ihe lift unit its oil lines and the implement hitch Remove the two plugs found under the tractor body Disconnect the rear light cable connection Place the differential casing on a stand and lift the gearbox
120. seal on one of the cover fastening screw heads before returning it to the owner Overhauling or repairs must be entrusted to FIAT Service Shops only Whenever a control box is opened for overhaul or repair operate if for a certain length of time without the cover on so that it will warm up and eliminate any residual dampness on its elements if any CONTROL BOX GP 1 247 SPECIFICATIONS 9 Description Data Cut out relay j feed current for thermal stabilization 00 gt 30 v ve Guleln voltage sionis EE Sa Geb ve EROR cuts AE 25 1 to 25 9 V voltage variation for contact closing stroke 202 V Perse current eee seat 6 to f4 A ait gap contacts closed axis A A Fig 150 085 mm 0 010 in gap between contacts d Fig 150 6 2 2 ee ee 0 64 to 0 76 mm 0 025 to 0 020 in Voltage regulator i batteries capacity at 30V ee v LL eee 100 Ah average load current i 8 A rated voltage after thermal stabilization at a room temperature of 5004 39 C 122 37 F for 80 minutes 2 2 2 2 v Ll vus 28 7 to 29 7 V feed voltage for thermal stabilization satis gt 30 V ait gap C Fig 49 ee eee enn 0 99 to 1 11 mm 0 039 to 0 044 in Current regulator i rated current on battery at 50 3 C 122 37 F room temperature after thermal stabilization w ek apanya Pa eee E 610 74 A tated current check voltage aaua aaa a ee i 28 v NF gam C Fig
121. section of roller tooth shaft Gg and Gp Seals Vr Adjusting screw Mount the worm gear shaft with its bearing shims and check it for free rotation which must be ac complished without excessive effort The correct functioning of the mechanism requires that the distance between roller and worm gear be as smal as possible and corresponding o the original specificalions To this end after mounting the unit and positioned the steering arm as in Fig 4 22 this corresponding to straight forward motion of the tractor the adjusting screw Vr Fig 123 should be screwed on n order lo lake up the play between roller and worm Screw in addition check that this condition remains un varied as the steering wheel is turned 309 left and right After adjustment tighten the lock nut of screw Vr To refit the guide box assembly to tractor reverse the dismantling procedure Alter assembly service the guide box with SAE 90 oil and the drag link grease nipple with chassis grease 75 D i Steering tests Af 5 mm 0 1869 and a camber of 2 are acceptable Check tightening of the steering lever b for straightness to avoid early front tire wear SPECIFICATIONS ASSEMBLY CLEARANCES AND PERMISSIBLE WEAR OF STEERING olts and the cross tie rod clamps and check fie rods ter adjustment check the steering wheels alignment with the tractor axis nevertheless a toe in of about MECHANISM STEERING BOX TIE RODS AND LEVER
122. st The following cases may occor when such tests are being performed l Torque current and speed up to specifications ll Low speed and torques with no load high current drain trouble to be traced to armature winding partly short circuited or grounded or to mechanical defects such as worn out bushes armature shaft bent loose polar shoe screws A simple inspection may indicate that some armature turns are grounded as the corresponding com mutator blades would be deterioreted by heavy current passage that would take place through the brushes lil Motor does not start and high current drain might be caused by the armature or the field coil completely grounded IV Motor does not start and no current drain or less than 24 A no current drain requires checking the solenoid contacts on the commutator and of the brush spring performance Very low current drain signifies that the field series winding is interrupted The solenoid winding interruption may be checked with a test lamp V Low speed with no load low current and torque the fault may be traced to the internal resistance of the motor or to commutator expanded bars due to centrifugal force The first trouble is readily detected when the motor is dismantled the second one may be caused by the free wheel too hard to turn or by field coil connections unsoldered from the commutator bars 112
123. struments periodically calibrated and according to the prescribed rules and methods No removal of group seals is allowed for taking such measurements Checks Operations and cautions Test efficiency of regulator group as foliows a a test bench will be provided with a FIAT R 115 140 24 1600 Var 2 or FIAT DC 115 24j7 3 C ge nerator coupled to a motor whose speed may be gradually stopped b installation should have the measuring devices and insiruments concerning the testing of cut out relay current and voliage regulators according to instructions and rufes hereafter Cut out relay 1 Closing voltage 92 Wiring should be as shown in Fig 143 generator speed should be graduaily increased ii an aS d aia 30 3 amp 51 n 7 1 ald 8G d L 3 Fig 143 Electrical diagram for testing the cut out relay closing voltage M Motor of test bench G Generator V Voltmeter i i 30 3i 6 5 Fig 144 Electrical diagram for testing the inversion current M Motor of test bench G Generator A Ammeter V Voltmeter Batteries are connected in series and must be fully charged at a capacity of 60 Ah Voltage regulator Current regulator Fig 145 Electrical connection diagram for the check ing of the voltage regulator and of the current regulator M Motor of the test bench G Generator V Volimeter A Ammeter
124. t ans x 2d 30 A Idling test of motor under no load voltage 2 ee 24 v speed rate ed o ovv i 4000 to 5000 r p m Commutator out of round s 22 2 2 e dC 0 02 mm 0 00078 Pole shoes inner diameter 2 222 llle 75 88 to 76 mm 2 0855 to 2 9921 Armature outer diameter 3E Ran E Sr ecce T ded PCR 74 95 to 75 mm 2 9508 to 2 9528 internal total resistance of motor when stopped at 40 C 1049 F 2 2 0 0205 to 0 0215 ohm Resistance of main field coil in series at 20 C 68 F 00060 to 0 0070 ohm Resistance of secondary field coil shunted at 2009 C 68 F 0 4 1 to 1 14 ohm j energizing current at 24 V 20 C 68 F 2 2 000 17 A Solenoid solenoid internal coil resistance when heated 2 00 1 88 to 1 46 ohm solenoid lift force with a current of 9 A and an air gap of 5 mm 0 18 not less than 11 kg 24 2 b Solenoid mobile contact travel is BRR OS oo le ED 6 4 to 8 45 mm 0 252 to 0 333 Solenoid core travel tert nnn Xa pe ape yy ae MEE ee To LJ 8 5 to 10 1 mm 0 334 to 0 397 Brush spring pressure new brushes Soul dum weed a ej 1 15 to 1 30 kg 0 82 to 0 58 Ib Armature axial play C Fig 165 4 vv VL 0 35 to 0 75 mm 0 0138 to 0 0295 GLOW PLUGS The glow plug consists of a thin wire helix contained in an insulator and surrounded by a metallic shell which is heated by the incandescent coil to 850 C
125. te ihe operation of fastening the gearbox to the transmission casing GEARBOX AND EPICYCLICAL REDUCTION GEAR COMPONENTS SPECIFICATIONS ASSEMBLY CLEARANCES AND PERMISSIBLE WEAR Wear a Assembly clearances mm in limits mm in Between gearbox shaft 0 010 to 0 106 0 35 splines and their driving 0 0004 to 0 0042 0 0138 and driven gears Between gearbox driving 0 10 to 0 20 0 50 and driven gear tooth flanks 0 0039 to 0 0079 0 0197 i Between driven gear pinion tooth flanks and the flanks 0 07 te 0 13 i 0 35 of epicyclical fixed reduc 0 0028 to 0 0081 0 0138 tion gear Epicyclical reduction driven gear 20 4 to 2043 needle seat diameter i 0 8035 to 0 8043 00110 0 06 Q5 Epyciclical reduction driven gear 2 99 to 3 00 Between needles and axles 0 0004 to 0 0024 0 0059 needles diameter t 031177 to 0 4181 of epicyclical reduction dri S i ven gears i i i i oo i i Epicyclical reduction driven gears axle 14 400 to 14 289 i diameter 0 5669 to 0 5665 i t i i er uet daa 1 H f Reverse shaft bush inner diameter 25 065 to 25 098 i obtained by accurate lapping 0 9868 to 0 9881 i 1 i 1 Between bush inner diam 0 065 to 0 119 0 30 M i eter aad its reverse shaft 0 0026 to 0 0047 0 0118 Reverse shaft diameter i 25 000 to 24979 E 0 8842 to 0 9834 i i A Control rods relea
126. the generator Mind that when assembling the drive end bracket its introduction may be facilitated by holding terally both brushes and Springs After reassembling repeat the functional checks as shown in paragraph Bench testing the generator FIAT GENERATOR R 115 140 24 1600 Var 2 SPECIFICATIONS 7 Items Values Speed ak PEE oa sed ei o T o f g m 980 1150 Operational test as motor E RO Voltage ie og one pee 24 V l Cunt i 3 5 5 A Running generator before plotting of the curve hot condi VON dw Da put UNIT Erie is Pp m 2000 tion run duration 30 m nutes amp versus reys i Current E A 3 k 3 3 3 E35 A i of 45 min at 2000 p m Running scene p of 15 min at 4000 r p m Output current 2 050 5 25 0 3 4 x i Voltage L IN 28 V Mistingi tasti Sas haste dh P edd s ec j Commutator temperature increment not more than 909 C 1949 F Casing temperature increment lla not more than 459 C 1430 FY Resistance at 20 C field colls nargi go e 0 Ait dede uds i i 14 5 15 5 ohm DTURIUBSIEE ui ae y egani nih peri Pe a ai 0 520 0 545 ohm Commutator bar maximum allowed eut ot round 0 01 mm 0 00039 Brush duration S7 1800 2500 hours Pressure by springs on brushes new eA E 0 89 0 76 kg 1 521 1 675 1b Brush cross clearance inside brush holders 0 1 0 3 mm 0 039 0 0118 Brush end clearance 0 Ga
127. the generator and connect the rheostat maximum resistance start it again and run it up to 3500 R P M decrease the resistance gradually until the voltmeter indicates 28 V and the ammeter a regulation current of 68 to 7 4 A As the resistance continues to decrease the current should slowly rise and the voltage drop sharply almost to 24 V 101 Trouble shooting The various cases which may occur during the operation of the control box are the following A Low charging rate with a fully charged battery This is the condition of a generator control box system working correctly B High charging rate with a fully charged battery This condition indicates that the voltage regulator does not jimit the output as it should because a high charging rate not only damages the already fully charged batteries but also the equipment of the system The causes are the following a high voltage regulator setting b defective voltage regulator windings or additional resistance 7 Fig 159 C short circuit across the generator positive terminal and field winding which prevents the current from passing through the regulation resistance at voltage regulator contacts opening d insufficient connection between contro box and generator through mass e high temperature which reduces the battery electromotive force reacting to the charge so that the battery absorbs a high charging current even if the regulator set voltage is normal f
128. troke with turbulence chambers Sumbere of cylinders oll d post rA Ae e prier ra 4 Pore and STOKE quedes cerei eR A Ne day Gace d m 5 88x 100 mm 3 346 x 3 937 CRIICCIRIAGeNINQE s cen ont bie eee eie EL d per T RAT 2270 cm 138 5 euin Compression AMON APATO darrean sts Uu ee atin LS ty A B 21 5 1 Maximum rated horse power with air cleaner without fan and exhaust mufiler 40 H P 0 Maximum H P MOYO ped at ec n da eaS ma e soaa ah A 2300 R P M Msi MEER I EOD SEEN a 143 kgm 101 ft Ib Maximum torque UewelbBedbaton e e e cu pi PACA gates ee Es oy v 1800 R P M Engine weight with air cleaner without lubricating oi 200000 275 kg 600 Ib Lubricating oil quantity in sump and pipes 0 2200 7 kg 15 5 fb Timing V Opens cu us vous 3 before T D C Inlet sig eade Bg VUE 1 doses 23 after B D C OPENS a usse oce Ba 23e D C LI PL EE kon BOSE 3 Pais s s Clearance between valve Stem and rocker arm for check of timing engine cold 0 375 mm 0 0147 in Normal running clearance between valve stem and rocker arm engine cold inlet and exhaust aa Pap Re SCRE Gepud eel iN Ate nd gh e E Mr of N 0 20 mm 0 0078 in Fuel supply Plungertype fuel pump er fee a Om FEKE AT Operating pressure NU uhi ides ansa 12 toS kg em 171021 p s i injection pump Bosch licence with 4 for fuel pump without sediment bowl type PES 4A 60B 3110 L4 1 plungers for fuel pump with Sediment bowl type PES 4A 60B 410 L4 16 Dire
129. ts P it is easily performed by following Figs 86 and 87 and caring that the cluich gearbox plate is centered with reference to the caps and that the elastic pins are oriented as shown in Fig 85 Clutch assembly to be performed on fixture A 111063 using it on the side marked with the tractor number For clutch adjusiment it is not necessary io place upon the fixture A 111063 the power take off disc which remains outside the assembly and is substi iuled by a sing Fig 88 superposed to fixture E 55 Fig 89 Clutch adjustment using fixture A 111063 E G H Fixture components D Spacer be aring No 411 R used also for other wheel types belonging to ihe series 400 Clutch control adjustment Assembly cf clutch on engine Fig 90 Clutch adjustment on engine usin A 117063 complete B Clearance 1 5 2 mm 0 0591 0 0787 in 56 g tool Clutch adjusiments should be made as follows a adjustment of the complanarity of the cluich disengagement three lever ends The adjustment lo be made according the Fig 88 ie by checking using feeler gauge ihat between ihe lever ends and the checking elemenis laid upon the spacer there is a max clearance of 0 1 mm 0 0039 a different clearance requires fo unscrew the fastening nut and adjusting the proper screw Note f clufch is installed on fixture amp 111063 A the adjustment may be made after ihe assembly on ihe tractor using fixture A 117063 p
130. ttery charge ee I 1 28 100 1 25 7595 4 22 1 5094 1 49 2595 1 16 nearly discharged uH i completely discharged Fig 162 Batteries mounted on tractor Funnel of level control plug for water filling C Cover for level control plug 108 i j i i i i i i i i H Discharge of battery during operation Refitting and removing from tractor Therefore a battery may be considered charged if the efecirolyie gravity reads between 1 28 1 24 at 259 C 779 F Avoid letting the battery to discharge complstely recharging should be made when gravity is not less than 1 16 20 B The recharging current rate should never exceed 6 A in order to maintain ihe batlery charging within actual conditions the checks should not be made when 1 the electrolyte is different from the prescribed one if distilled water is being poured in take time to set a uniform distribution 2 battery is hol or immediately after repeated startings or when electrolyte is cold The most suilable temperature is beiween 159 and 259 C 59 77 F if the batiery cells have a specific gravity with dif ferences exceeding 0 02 or high or low gravities accompanied by excess of heai more than 10 C 50 F above the ambient temperature call the ervice Organization of the battery supplier During operation the batteries are not to be perio dically recharged as the tractor charging plant
131. when introducing the starting and lighting key and setting it on position 1 the battery signal lamp remains lighted the generator is normal if engine is being started and accelerated to a given speed the Hight should go out If on the contrary the amp goes out only when engine has reached high speeds the trouble may be due to faulty windings grounded or short circuited or to the armature Generally the higher the R M P rate at which the charging begins the higher the potential damage It the lamp remains lighted this indicates an interruption between the generator cables and the regulator group or shows that the group contacts are oxidized and internal connections dissoldered or that some generator coil is interrupted or completely grounded if the above procedure leaves the light out and the trouble persists also after replacing the bulb this signifies that the trouble is to be found between bulb holder and switch or between switch and the con nections of the components branched upon it When the battery indicator fight goes out to go on again the engine speed being steady the fault is pro bably due to the regulator group or fuse or to the electric connections the Jacks 85 Generator repairs are to be carried out as follows a Brushes lf broken chipped or worn out replace them with spare parts furnished by the FIAT Company Sezione Ricambi Be sure to avoid the installation of other brush makes as FIAT spares
132. wing 1 Remove the strut and check that distance 1 1 Fig 190a is 15 0 5 mm 0 590 0 02 HF other wise change one or two spacers H between spring and support Note that it would not be con venient to use a large number of shims H to decrease the clearance because that would vary the load and conditions of the spring M Fig 186 Valve block Fig 187 Hydraulic lift linkage installed on the tractor 1 Pressure relief valve 2 Lift control valve 3 Cylinder 1 Top fink adjustable 2 Removable pin 3 Fixed pin pressure safety valve 4 Discharge valve 10 LIK arms 4 Lett lifting rod 5 Check chains 6 Lett lower link 7 Snap Stroke adjusting screw t Contro spool adjustment plug pins 8 Right lower link 8 Levelling iever 16 Top iink mounting pin See new improved drawbar assembly on page 138 126 Fig 188 Adjusting the top link supporting spring tension Fig 188 Hydraulie system pressure reading using a using tool A 197016 pressure gauge with fitting A 197035 mounted In place of the safety valve 2 Install the lever A 197018 in the mounting holes Fig 188 and by pressing downwards take up completely the clearance existing between cover and Support at the lower stop shown with an arrow 2 Fig 180 a In these conditions the distance I should measure 22 5 0 5 mm 0 886 0 025 a greater distance means that the surfaces of the lower stop are worn and need added mat

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